Just for a short bit of background, the reason I'm tracking this particular subversion oddity down is because I found it troubleshooting our new Maven setup (specifically the release plugin). release:prepare gives me the same error buried in a stack trace.

Executing this command...
svn copy http://[server]/svn/tran1/myproject/trunk http://[server]/svn/tran1/myproject/tags/testtag

...gives me the following error:
svn: Server sent unexpected return value (403 Forbidden) in response to PROPFIND request for '/svn/tran1'

I thought this might be an authentication issue, but I'm able to do pretty much every other subversion thing I can think of. Checkout, add, commit and update all work from the command line. And here's where it gets really weird... I can create branches using Eclipse's Subclipse plugin. This might not be all that strange if Eclipse isn't actually doing an svn copy.

tran1 also has a sibling subversion repository next to it. The copy command works fine there.

The URL it's trying to get permission for also looks wrong. It's asking about /svn/tran1, when the permissions are set up one level deeper /svn/tran1/myproject/

Any ideas what might be causing my error? Thanks.