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blog network server windows

FreeRadius.net service doesn’t work

The FreeRadius.net package built for windows uses the XYZservice.exe wrapper tool to start a normal application as a service. However on Windows 2008 and higher the service starts but RADIUS is not listening on the configured ports. You can check if it is listening with netstat.
netstat -an | findstr 1812

The Debug mode of FreeRadius.net (using the provided batch file) however works fine. It seems the built radiusd.exe will not start with the default options on Windows 2008 and higher. You can check this by manually starting from a command prompt:
C:\FreeRADIUS.net\bin\radiusd.exe -f -d C:/FreeRADIUS.net/etc/raddb
So that is the reason why the service doesn’t start.

Solution: COnfigure the XYZservice to start the application with the debug parameters.
Edit C:\FreeRADIUS.net\bin\XYZservice.ini
change:
CommandLine = C:\FreeRADIUS.net\bin\radiusd.exe -d C:/FreeRADIUS.net/etc/raddb -AX

Now if you start the FreeRadius.net service and check with netstat you will see the RADIUSD.exe listening

Categories
blog network server windows

RAS or NPS forward RADIUS request to same server different port

The address of the remote RADIUS server x.x.x.x in remote RADIUS server group yyyyy Resolves to local address x.x.x.x.
The address will be ignored.

Use case scenario: You want to forward RADIUS requests incoming on the server to some software, possibly for setting up OTP authentication.

My scenario: Extra security for PPTP vpn tunnel to Windows server with RAS (Routing and Remote Access) by using VASCO Identikey OTP (One-Time-Passkey) software (the same applies for other software such as RSAid). Normally the recommended setup is using two servers, one for the RAS connection and one with the VASCO Identikey middleware software on it. When you deploy like this you will not face the problem I’m about to describe. However if you have only 1 Windows server at your disposal and you install the VASCO Identikey software on the same server as the RAS and NPS (Network Policy Server) role you will run in to this problem.

Problem description: You have configured RAS correctly for PPTP MSCHAP v2 connections. In NPS you have configured a connection policy to forward the RADIUS requests (authentication and accounting) to a remote RADIUS server group. The authentication fails, VASCO audit viewer does not show any attempt to authenticate to the VASCO Identikey Radius server. In the eventviewer application log there is an event ID 25 with the following error:
The address of the remote RADIUS server x.x.x.x in remote RADIUS server group yyyyy Resolves to local address x.x.x.x.

The problem is that NPS cannot forward RADIUS requests to the same IP address as itself. Even if the software is listening on another port, or you configure 2 IP addresses on the same network card. NPS insists that the IP address of the remote RADIUS server is the same as it’s own IP address and ignores your configuration to forward the RADIUS requests.

The solution is to use the loopback IP address range. For example 127.0.0.2. Unfortunately VASCO Identikey is licensed on IP address and as such you can’t change it to listen to the loopback IP address without also requesting a new license. I have not tried this, so even with the new license I’m not sure VASCO Identikey will listen on loopback IP address. Maybe other OTP software can do this, check with your vendor or manual.

What can you do? Use a RADIUS proxy to sit between the NPS and VASCO Identikey. If you have a linux server around you can use opensource FreeRadius software on that linux box to proxy the RADIUS requests between RAS/NPS and VASCO Identikey.
If like me you had nothing but this 1 windows server, you can use the FreeRadius.net software, this is a prebuilt binary of the opensource FreeRadius software made for windows versions. The software is quite old and not updated but it still seems to work for our simple setup.

I have installed the FreeRadius.net software in C:\FreeRadius.net
I have configured it to accept RADIUS requests on interface 127.0.0.2 port 11812 and forward them to a RADIUS server on IP x.x.x.x on port 18120 (I changed the default RADIUS ports for VASCO and FreeRadius to avoid conflicts with NPS/RAS).

configuration file c:\FreeRadius.net\etc\raddb\clients.conf
I have put all the default things in comment (#) and add
client 127.0.0.2 {
secret = testing123
shortname = localhost2
}

configuration file c:\FreeRadius.net\etc\raddb\radiusd.conf
I have put the default listen directive in comment (#) but you must leave the bind = * line and add
listen {
ipaddr = 127.0.0.2
port = 11812
type = auth
}
listen {
ipaddr = 127.0.0.2
port = 11813
type = acct
}

configuration file c:\FreeRadius.net\etc\raddb\proxy.conf
In this file I configured both the NULL realm for plain usernames and the DEFAULT realm for all others to forward to VASCO Identikey wich I have listening on the port 18120 & 18130 (auth & acct).
# This realm is for requests which don't have an explicit realm
# prefix or suffix. User names like "bob" will match this one.
#
realm NULL {
type = radius
authhost = 10.x.y.z:18120
accthost = 10.x.y.z:18130
secret = testing123
}

#
# This realm is for ALL OTHER requests.
#
realm DEFAULT {
type = radius
authhost = 10.x.y.z:18120
accthost = 10.x.y.z:18130
secret = testing123
}

You can now start the FreeRadius.net in debug mode, using the supplied batch file you can test your configuration.

Below I will attach screenshots of my configuration for NPS, RAS and VASCO.
RAS settings (EAP can be enabled if you like)
NPS RADIUS client
NPS configure remote RADIUS server group
NPS connection policy screenshot
NPS Network Policy
VASCO port settings

With thanks to:
http://bent-blog.de/vasco-identikey-server-auf-microsoft-forefront-tmg-2010/

Categories
blog

CentOS 6 kernel panic selinux config file error

If you get a kernel panic on CentOS or RedHat as shown below and you recently changed the selinux config, then there might be an error in the config file.

None of the kernels in the GRUB boot menu will boot, you get a kernel panic:

Kernel panic - not syncing:  Attempted to kill init! Pid: 1, comm: init Not tainted 2.6.32-504.3.3.el6.x86_64 #1 panic+0xa7/0x16f do_exit+0x862/0x870 fput+0x25/0x30 do_group_exit+0x58/0xd0 sys_exit_group+0x17/0x20 system_call_fastpath+0x16/0x1b
Kernel panic – not syncing: Attempted to kill init!
Pid: 1, comm: init Not tainted 2.6.32-504.3.3.el6.x86_64 #1
panic+0xa7/0x16f
do_exit+0x862/0x870
fput+0x25/0x30
do_group_exit+0x58/0xd0
sys_exit_group+0x17/0x20
system_call_fastpath+0x16/0x1b

Booting in single user mode doesn’t work either.

Here’s how to fix this:
1) Reboot, and go in the GRUB menu. You have 3 seconds to strike the arrow keys before it will automatically boot the default kernel.

GRUB boot menu
GRUB boot menu

2) Select the first line, the default kernel, and press the E key on the keyboard to edit the parameters. You will then see the following.

Edit GRUB boot options
Edit GRUB boot options

3) Use the arrow keys to select the 2nd line, that starts with kernel. Press the E key to change this line, use the arrow keys to go to the end and type a space followed by enforcing=0

GRUB edit kernel line
GRUB edit kernel line

4) Press enter to conform and then press B to boot the system.
It should boot up fine now.
Now edit the selinux config file (/etc/sysconfig/selinux) and correct your mistake.
In my case I set disabled for the SELINUXTYPE variable, that’s wrong it has to be set for the SELINUX variable. In the screenshot below I show you the correct settings in the config file to disable SELINUX.

SELINUX disabled correctly
SELINUX disabled correctly

5) Now reboot and everything should be fine!

Categories
blog howto

How to delete LinkedIn saved e-mail contacts

edit: Solution all the way at the end, skip to the direct link if you are thinking TLDR.

After receiving one to many e-mails from LinkedIn with the message that e-mail contact x had joined LinkedIn, I started looking for a way to delete these contacts or address book and stop receiving these mails. It turns out this is not as easy as you think.

Firstly disable the sending of these e-mails is not possible, it’s not listed on the options to opt-out of different kinds of e-mail communications from LinkedIn.
LinkedIn communication settings

If you read some posts on the internet everyone keeps reffering to https://www.linkedin.com/contacts/manage_sources/ but this only lists options to add sources for synchronizing, I had nothing enabled so I couldn’t disable anything. At the top of content it showed me the number of LinkedIn connections and I could click on that, but it showed me a list of my connections, even after changing the filters to saved contacts it didn’t show anything besides connections.
LinkedIn contact settings

So the wise thing to do is open a support ticket, and so I did but 5 days later the support person could only send me standard responses and did not really understand or read my question.
LinkedIn support ticket

SOLUTION: I then finally found the answer by accident after I was changing my profile information.
When you get to this page: https://www.linkedin.com/fetch/importAndInviteEntry it show at the top Manage imported contacts. And that brings you to this page: https://www.linkedin.com/people/contacts where you will see all your imported contacts and you can delete them all.

Finally, no thanks to LinkedIn support.

Categories
blog howto linux network server virtualization

Virtual Private Server on SSD storage

 Update: After reviewing the offerings, I’m no longer running my VPS at digitalocean. Instead I’m using Linode at the moment.
www.linode.com

Easily deploy an SSD cloud server on @DigitalOcean in 55 seconds.

Recently I read about the virtual private servers you can create on www.DigitalOcean.com. They call them Droplets, and they get created in less then a minute if you don’t enable back-ups, or just a couple of minutes with back-up service enabled. You can choose between different geographically located data centers. You can choose between New York, San Francisco, London, Amsterdam and Singapore. You get one public ip address (or ipv6 if you prefer, but who does anyway).

You can choose out of some pre selected minimal OS installations such as Ubuntu, CentOS, Debian, Fedora and CoreOS. Or you could even deploy your VPS complete with a LAMP (Linux, Apache, MySQL and PHP) or even with WordPress of Drupal setup. If I looked at the price (10$/month or 12$ with back-up) for a VPS, with 1 CPU, 1GB RAM, 30GB DISK and 2TB data transfer, and compared that to what I was currently paying for 2 shared hosting plans, the math was clear. For a bit less than what I was paying I get my very own Virtual Private Server where I can configure everything I want and have full rights on everything.

For me, as an enthusiastic system engineer, with experience on multiple Linux flavors, this was a very nice project. Starting from a minimal CentOS 7 installed Droplet, I quickly installed and configured Apache, Nginx, MySQL and PHP and started serving web pages. My first tests were a success. I configured different management tools and secured the system with a software firewall. Because your VPS has a public ip address you must think good about security. It took some time getting used to the new firewall software system in CentOS 7 called firewalld. After some cursing I had it set up as I wanted.

The next step was to migrate the first of my existing websites over to the new VPS. I chose to configure virtual hosts in an organized manner so that I could always expand to more websites if needed. After transferring the databases and website data, I set course for a new goal. Making my sites more secure by using HTTPS encryption on the login pages. By using the free 1 year class 1 certificates from www.startssl.com I did not have to make any extra costs. Update: Using Let’s Ecrypt now and HTTPS on all pages! After some hours of configuring and testing I had everything running smoothly. I migrated all the DNS records to my new VPS and shortly after my 1st website was running live on the new VPS.

My next goal was to set up mailboxes for every virtual host and using IMAP to connect to them. I choose POSTFIX as the SMTP server and DOVECOT as the IMAP server. POSTFIX was configured for using virtual mailboxes that don’t require a Linux user. DOVECOT was configured for SSL/TLS encrypted connections so password are never sent in clear text. To finish it off I installed ROUNDCUBE as a web mail solution.

After my successful first website migration the second one followed quickly and went smoothly as well. This time I also needed a FTP setup and I chose VSFTPD and again made it possible to use SSL encryption.

The VPS is now running all of my websites, except this blog.

PS: If you are wondering why I don’t migrate this blog, running on my home server, that’s because it’s a challenge to keep a website running on a homeserver with minimal hardware costs and dynamic internet ip address. It also has some other uses for me besides serving this blog.

Categories
blog server windows

Windows 7 profile SID wrong mstsc can’t login

This is a very strange problem I came across on a windows 7 Embedded thin client. I don’t quite understand what went wrong but I’ll give you a detailed description.

CASE:
The user has a thin client with Windows 7 Embedded that’s been entered in to the Active Directory domain. On the public desktop of the thin client there is a RDP file to connect to a Remote Desktop Server (a.k.a. Terminal Server). The user logs on to the thin client using their AD credentials. The user was able to log on to the server using the RDP file without problems until today.

SYMPTOMS:
– User can’t log on to the Remote Desktop Server, the error received is:

The connection was denied because the user account is not authorized for remote login

TROUBLESHOOTING:
Normally this just means that the user is not a member of the “Remote Desktop Users” local group on the server.
– I verified the user was a member of the correct groups to log on to the server.
– I then tried to log on the server with the same credentials from a different workstation. This worked without a problem. Which led me to conclude at the server-side everything was OK.
– On the troublesome workstation (thin client with WIN 7 E in my case) I launched remote desktop with the “Run As Administrator” option and supplied credentials for an admin account. I tried to connect to the Remote Desktop server using the credentials of the troublesome user account. This worked without a problem.
– I tried again without the run as, and it failed again with the same error.

This led me to my conclusion that something was very wrong with the user profile on the workstation for this domain user.

SOLUTION:
I decided to delete the user profile on the local workstation since nothing is stored in it (they don’t work locally). However when I opened Explorer and went to see in “C:\Users” I saw 2 identical folders with the same name (the username of the troublesome user). It seems there were 2 identical profile folders. I didn’t think it was possible for 2 folders to have the same name.
I deleted both folders!
I then opened REGEDIT and went to HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\PROFILELIST
I saw multiple user SID’s and checked them all. To my surprise there were 2 different user SID’s that both had a value c:\users\problem.username underneath it. So 2 different user SID’s for the same username. I thought that was impossible. I deleted both registry keys.
After deleting the profiles and the keys I logged back in with the user and profile was recreated and the remote desktop worked perfectly.

So it seems that the remote desktop client was sending the wrong SID to the server and that was the reason for the unauthorized error message.

Categories
blog howto server virtualization

HP VAAI plugin missing from Vmware ESXi 5.1 U1 HP Customized edition sep 2013

Also read the updated EDIT section at the end.

Summary:
HP has left out the VAAI plugin in the September 2013 ISO’s for ESXi 5.1 and 5.5. People adding a hosts to a SAN (like a P2000G3) will have troubles without this plugin.
New VMFS-5 datastores that are created on a host that has the VAAI plugin will use ATS-Only locking mechanism for the datastore. Adding another host without this VAAI plugin will keep that host for correctly seeing the datastores.

Situation:
Server HP Proliant DL380 G6 freshly installed with VmWare ESXi 5.1 U1, using the “HP customized sep 2013 ISO”.
A couple of months ago I already had installed 2 other servers with VmWare ESXi 5.1 U1 using the “HP customized apr 2013 ISO”.
These 2 previosly installed hosts had been connected via ISCSI to an HP P2000G3 SAN with 2 LUN’s and 2 datastores were created without problems. Both hosts saw these datastores.

Problem:

The new vmware host would briefly show one or both datastores after a RESCAN HBA, but they disappeared after 2 seconds. Also the capacity values shown during those 2 seconds were wrong.

Troubleshooting:
I switched the ISCSI from the Intel NIC to the Broadcom NIC, but the problem remained the same.
I updated all the firmware on the server using the Servicepack for Proliant CD.
After that I further updated using the “VMware vSphere 5 Supplement for HP Service Pack for ProLiant” and the included HP SUM.
I checked the vmkernellog file on /tmp/scratch and saw these errors:
2013-11-28T13:53:58.536Z cpu11:9191)WARNING: FSAts: 1304: Denying reservation access on an ATS-only vol 'P2000LUN12'
2013-11-28T13:53:58.536Z cpu11:9191)WARNING: HBX: 1955: ATS-Only VMFS volume 'P2000LUN12' not mounted. Host does not support ATS or ATS initialization has failed.
2013-11-28T13:53:58.536Z cpu11:9191)WARNING: HBX: 1968: Failed to initialize VMFS distributed locking on volume 51f29f9b-26f5059a-39c6-00237deeceda: Not supported
2013-11-28T13:53:58.536Z cpu11:9191)Vol3: 2359: Failed to get object 28 type 1 uuid 51f29f9b-26f5059a-39c6-00237deeceda FD 0 gen 0 :Not supported
2013-11-28T13:53:58.536Z cpu11:9191)WARNING: Fil3: 2492: Failed to reserve volume f530 28 1 51f29f9b 26f5059a 230039c6 daceee7d 0 0 0 0 0 0 0
2013-11-28T13:53:58.536Z cpu11:9191)Vol3: 2359: Failed to get object 28 type 2 uuid 51f29f9b-26f5059a-39c6-00237deeceda FD 4 gen 1 :Not supported
2013-11-28T13:53:58.581Z cpu11:9191)HBX: 707: Setting pulse [HB state abcdef02 offset 3440640 gen 1 stampUS 5568056524 uuid 529735be-0b3c273d-6396-18a90550fb2c jrnl drv 14.58] on vol 'P2000LUN12' failed: Not supported

So after researching on the internet I read up on VAAI what is responsible for the ATS locking of the ISCSI volumes. You could turn it off, but you have to do it on all the hosts and power all the VM’s down. This was not desirable and the other hosts worked fine. So I wanted to fix this one new host.
I logged in using SSH on the hosts and check the VAAI status with this command:
esxcfg-scsidevs -l | egrep "Display Name:|VAAI Status:"
On the working hosts it showed my ISCSI disks and next to VAAI status showed: supported.
On the troublesome host it showed the ISCSI disks and the VAAI status showed: unknown.

Solution:
VmWare support were no help, just asking me for a collection of all the logfiles and not reading my log excerpt containing the errors shown above. I gave them the logs, but 5 hours later they still hadn’t responded. That’s not what I call good support.
I read up on more of the VAAI stuff, and apparently it’s HP plugin in VmWare. So I looked around to find a download for it, to force it to update.
To my surprise I find it on this page: http://h18004.www1.hp.com/products/servers/software/vmware-esxi/driver_version.html
It’s listed as a component for the April 2013 version of the HP customized ISO, but they have now left it out in the September 2013 version.
So I download the HP VAAI plugin from here: http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdDetails/?spf_p.tpst=swdMain&spf_p.prp_swdMain=wsrp-navigationalState=idx=|swItem=MTX_30e09de4fc7e4498bfd9102a99

Download the zip file, extract it. Inside you’ll find another ZIP file with the word bundle in the filename. Upload this zip to your ESXi server’s /tmp/scratch directory (to do this: enable SSH using the client and use WinSCP or FastSCP).
Login to the SSH shell (using Putty) and execute:
esxcli software vib install -d /tmp/scratch/hp_vaaip_p2000_offline-bundle-210.zip
Reboot the host, and the problem is gone. You’re datastores now appear under storage tab for this host.

Notes:
Just a heads up, it seems HP has also left this HP VAAI plugin out of the ESXi 5.5 ISO’s.
No idea if they just forgot, or are intentionally doing it.

I have asked to close the VmWare support case stating I have found the solution myself some 9 hours ago, but they haven’t even looked at it, it remains open.

EDIT:
It seems HP removed the VAAI plugin on purpose, because of a bug with some RAID controllers. Read the advisory here at this LINK.
Since I don’t have these RAID controllers, I don’t have any problem enabling the plugin.
You can read more in this forum topic:
VAAI support with ESX 5.1U1 on P2000 G3 MSA

Categories
blog howto server virtualization

MONITOR PANIC: Unable to decompress PPN from swap slot for VM

VMWARE ESXi 5.1U1

My VM would power off without apparent reason.
Looking in to the logs this error appears.

MONITOR PANIC: Unable to decompress PPN from swap slot for VM

I believe the underlying storage (a single SATA disk in my case) to be at fault, or almost dying I guess.
I storage vmotion’ed the VM to another disk.

Categories
blog howto server windows

VMware image customization in progress

Recently I came across an issue with a virtual machine that was deployed from a template. After the newly created virtual machine was booted up it seemed that the generalization did not fully complete. The password was not changed and some other minor things were not as it should have been after full customization runs.

We then saw that the VM kept saying “VMware image customization in progress” on every reboot right before windows boots. If you already have configured and/or are using the VM and don’t want to start over, here’s what you can do.

Open regedit and find the key:
HKLM\SOFTWARE\VMWare,Inc.\Guest Cutomization\
or on a 64-bit system:
HKLM\SOFTWARE\Wow6432Node\VMWare,Inc.\Guest Cutomization\
Change the value for “CustomizationInProgress” to “0”.

Then navigate to the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
Change the value for “BootExecute” to the default of “autocheck autochk *”, you should just delete the “sysprepDecryptor.exe” part and the enters after it. Be careful or your system won’t boot.

You should probably check your SID and see if it’s unique, to make sure the customization did indeed change this. Altough duplicate SID’s should be not a real problem (according to Microsoft), don’t do it on your servers!
http://technet.microsoft.com/en-us/sysinternals/bb897417.aspx

PS: In my case the customization failed because sysprep had already been run 3 times (template was cloned from previous deployed machine) and apparently you can only do it 3 times unless you add the special option not to rearm the licensing state (which vmware doesn’t add when customizing).

PS2: If you manually did sysprep but got stuck because with error

A fatal error occurred while trying to sysprep the machine

because of the rearm failure, try this: http://itfunk.wordpress.com/2013/01/09/resetting-rearm-count-in-windows-7/
Put the following in a bat file called c:\delwpa.bat

reg load HKLM\MY_SYSTEM “%~dp0Windows\System32\config\system”
reg delete HKLM\MY_SYSTEM\WPA /f
reg unload HKLM\MY_SYSTEM

reboot and using F8 choose repair computer, choose keyboard, type password and choose command prompt. Find your correct drive could be C or D or higher (depends on reserved partitions), and execute the BAT file. Rearm state will be wiped, after reboot you will see not genuine but you can rearm again 3 times now.

Categories
blog howto network server windows

Backup domain controller sync issues KRB_AP_ERR_MODIFIED 0x80090322 target principal name incorrect

My case:
1x Windows 2008 Small Business Server (named: SBS2008)
1x Windows 2008 R2 standard on off-site location (named: TS2008) BACKUP DOMAIN CONTROLLER & GC
Connection between the 2 servers was lost for nearly 3 months.
Replication would only work from SBS2008 to TS2008 but not from TS2008 to SBS2008.
I couldn’t view the shares on \\SBS2008 from the console on TS2008, i received the error “The target principal name is incorrect”. On SBS2008 I could view the shares on TS2008.
In the eventlog there were errors:

The Knowledge Consistency Checker (KCC) was unable to form a complete spanning tree network topology. As a result, the following list of sites cannot be reached from the local site.

Sites:
CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=domein,DC=local

The Knowledge Consistency Checker (KCC) has detected problems with the following directory partition.

Directory partition:
DC=domain,DC=local

There is insufficient site connectivity information for the KCC to create a spanning tree replication topology. Or, one or more directory servers with this directory partition are unable to replicate the directory partition information. This is probably due to inaccessible directory servers.

All directory servers in the following site that can replicate the directory partition over this transport are currently unavailable.

Site:
CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=domain,DC=local
Directory partition:
DC=domain,DC=local
Transport:

CN=IP,CN=Inter-Site Transports,CN=Sites,CN=Configuration,DC=domain,DC=local

The File Replication Service is having trouble enabling replication from SBS2008 to TS2008 for c:\windows\sysvol\domain using the DNS name SBS2008.domein.local. FRS will keep retrying.
Following are some of the reasons you would see this warning.

The session setup from the computer SBS2008 failed to authenticate. The name(s) of the account(s) referenced in the security database is SBS2008$. The following error occurred:
Access is denied.

The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server sbs2008$. The target name used was E3514xx-xxxxxxxxxxxxxxx/yyyyyyyyyyyyyyy/domain.local@domain.local. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Please …

The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server sbs2008$. The target name used was DNS/sbs2008.domain.local. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Please …

Demote and the promote for TS2008 would not work without forcing and doing a lot of NTDS cleanup on the PDC. So this was my last resort.

1st reboot -> did not work.
Doing a lot of searching and looking up the SPN for SBS2008 on both DC’s did not show any differences.

Luckily I found an older KB from microsoft on how to reset the kerberos secure channel between two DC’s.
http://support.microsoft.com/kb/288167

I had to disable the KDC (Kerberos Key Distribution Center) service on TS2008 and then reboot.
Immediately after reboot I noticed I could browse the shares on the SBS2008 without error.
This is because TS2008 was no longer supplied Kerberos tickets itself but requesting them from SBS2008.
Now I opened an elevated command prompt and forced a sync of all replica partitions and triggered the KCC checker.
repadmin /syncall /ade
repadmin /kcc

To check the replication backlog queue use:
repadmin /queue

After replication was succesful I put the KDC service back to automatic and started it. Problem solved.

If you can’t get replication working yet, you’ll need these extra steps.
klist /purge
netdom resetpwd /server:sbs2008 /userd:domain\Administrator /passwordd:* (the * will make it prompt for password).

Also you might need to check your DNS settings and put the IP adres of SBS2008 as primary DNS IP on the NIC of TS2008.

Other helpful information:
http://support.microsoft.com/kb/2090913