svn can't save server certificate

f I use any svn command communicating with the remote server I get the following error:

Error validating server certificate for 'https://...':

 - The certificate is not issued by a trusted authority. Use the

   fingerprint to validate the certificate manually!

Certificate information:

 - Hostname: ...

 - Valid: from Wed, 01 Sep 2010 08:25:36 GMT until Thu, 06 Oct 2011 08:25:36 GMT

 - Issuer: ...

 - Fingerprint: ...

(R)eject, accept (t)emporarily or accept (p)ermanently? 

If I hit permanently I can run the command properly. But on the next svn command I get the same question and have to confirm again! Why doesn't svn save my choice permanently? How can I solve this problem?

 

 

Search for the folder named "svn.ssl.server" (it exists for windows and *NIX servers) and delete it. You may be asked one more time to save the key but then it should stop asking after that point.

 

In windowx :e.g. C:\Documents and Settings\ken\Application Data\Subversion\auth\svn.ssl.server