VS 2010 Browser app to bypass work security

I run a discussion forum and I have just been told that one of my visitors cannot login to my vbulletin forum due to security restrictions at his workplace. With this in mind, I was wondering if its possible to create some mini app where you enter username/pw and it can login but bypass the security that somehow stops him logging in. He can still view the forum but can't post due to the login issue. I want to get around that.

Any ideas?

Thanks,

Jon