I upgraded the Agent SVN client and then received the logon prompt which corrected my issue.

I am using a VisualSVN server that is setup to use basic authentication. I can log onto the Visual SVN site via a browser, or through TortoiseSVN, but i get an error from the AgentSVN plugin.

SVN: E215004: Authentication failed and interactive prompting is disabled.

Can anyone help with this?