Port Identifier?

[Syxguns]

I'm having an issue with being redirected to to port :886 and not back to port :80. For example:

Log into forum fine, but when I select the Admin link to log into the ACP after I log in my address bar looks like this: http://www.place4musicians.info:886//admincp/index.php and the page will not load. If I delete :886 from the address bar then I will be taken to the correct page. Also when I log in, if I select the back button on the browser twice and then hit the Admin link I will be taken to the page.

I also receive the same redirect error when logging in to read a PM, but it seems that most of the forum controls work fine. Is there a Port Identifier that I can set the redirect port to or a way to tell the forum not to redirect to port :886? I've checked the IIS settings, and everything is correct. I know because I have two sites and did a comparison between the two set ups. Please note that I'm running a Windows server with IIS.

I was originally using a PHPBB Forum, which is still available on my actual site http://www.place4musicians.com The nice thing about this forum was that it had a server setting to set the port and force a URL setting. I can't find this function in VBulletin.

Any help would be appreciated. I asked at vbulletin.com but I was not given a solution.