Remove :81 in vbulletin url

Hi vbseo

Today has just appeared a problem with my forum, I have vBulletin 4.02 and when members click to read threads url of topic changes:

Example : http://site.com/forum/showthread.php...e&goto=newpost

ie the url is correct request but after a few seconds of quiet with this code: 81 and that my site is out, or file not found 404

Example : http://site.com:81/forum/showthread....e&goto=newpost

Can you help here who has experience with VB, where the jet and how to fix the problem.

Wishes for all.

Can any expert to tell me though it appears and how to fix ..

Thanks

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