IDEA 9: Sporadic connection failures with svn server

I'm trying to use the SVN Repository Browser in IDEA9 Community Edition with an Apache+Subversion server on Linux. I'm accessing it through an http URL, e.g. http://svn.company.com/repos. It's configured to allow anonymous access for read operations but any operation which modifies the repo requires Active Directory authentication.

The problem I'm experiencing is that I am getting error messages appearing in the repo tree. There seem to be only two different messages displayed:

svn: Software caused connection abort: socket write error

svn: Software caused connection abort: recv failed

However, sometimes it works and the level of tree I was trying to load does actually load. Then the next attempt will fail with one of these messages. There are no error messages in idea.log.

I am able to use TortoiseSVN with the same repo without any errors.