Decided recently to switch VisualSVN from local users to AD users, so we could easily add other employees. I added myself, gave Read/Write privileges across the whole repo, and then tried to log in. Whether I'm using tortoisesvn or the web client, I get a 403 Forbidden error:

You don't have permission to access /svn/main/ on this server.

I Googled a bit, but only found mention of phantom groups in the authz file. I don't have any of those. Any ideas?

It works just fine with local accounts.

EDIT: Don't know why I didn't try this earlier, but adding the domain before the username makes it work, ie MAIN/Bob. This normally only works when there are conflicting usernames...one local, one in AD, but for whatever reason it works here too. Kinda silly, but I can live with it.