If I use any svn
command communicating with the remote server I get the following error:
Error validating server certificate for \'https://...\':
-
SVN is smart enough to infer that you didn't actually bother verifying that the fingerprint matches.
Ahem.
But in all seriousness, https://sourceforge.net/apps/trac/sourceforge/wiki/Subversion#ServerCertificateVerificationFailed notes that you should open the project url in a trusted browser to check you're not being MITM'ed (should work for non-sourceforge too), e.g. you can try checking that you get the same fingerprint through Tor.