[Shasown]

The reason the no permission page shows is because the account doesnt exist, have a look on the member list for it. It may just be a temporary account created by the Vbulletin program itself, in order to self test, check or monitor usuage.

It could also be a temporary account created to allow full access to the site for search engines. Or an in built sub routine to map the site at certain times for search engines.

I am not sure if vbulletin deletes unactivated accounts after a set period, it could be the result of that as well.