Log into the CC.NET machine with the IDENTITY that runs the CC.NET service.
Find the svn.exe.
Open a command line prompt.
do a simple svn.exe list command, pointed at your SVN repository.
svn.exe list https://abc01.test.co.in:1234/svn/test/trunk/Myapp/
You will be prompted to accept the certificate.
Press "p" for permanent.
The key is...you must login as the same identity which runs the CC.NET service.