IIS Error after moving database to another SQL Server (certificate not found)

Hi,

today I tried to Upgrade our Safeguard Enterprise 6.0.xx.x Instalation to Version 6.1, so that Windows 8 is supported.

I did the "Best practice update manual" step by step and here was my first problem.

SQL Server 2005 is no longer supported.

So I searched the Knowledgebase and found something on how to move an Safeguard Database.

I created a new Safeguard Database with the Version we now use with the scripts from the installation files.

Then I restored it, with the Backup from the old SQL Server.

Next step I took the "old" Database offline und then restarted our sophos server.

The next time I tried to open the Management Center I had to reconfigure the database connection and then I was online again.

Here I build a new server configuration and installed it.

Reboot

But now the IIS which the clients communicate to, isn´t working anymore.

I can access the website and make the "CheckConnection".

Here I get:

<string xmlns="http://tempuri.org/"><Dataroot><WebService>OK</WebService>< DBAuth>failed</DBAuth>  <Error>Zertifikat nicht gefunden</Error></Dataroot></string>

Can anyone tell me, which certificate could be the problem.

Thanks