A problem we've found is that some sys admin's go power hungry and ban everything that they deem inappropriate at work,
Ah, luckely that's something we never do (I'm a sys admin at a regional broadcast station (tv and radio), loads of journalists, who, if needed, have to be able to look up everything).
Which is funny, since 90% of the time, you can get around ban's of a site if they run ssl (go fig!)
But ubb will forward them at certain times to the default URL. So when actively using the board, they will end up at that default URL. This behavior of ubb was one of the reasons to implement it.