There is an IFRAME pointing here for "Latest Announcements for UBB.threads™", but I can't imagine anything else in the CP relying on the ubbcentral.com server -- nor should that frame not loading up really effect your forums. Must be something else...

GangsterBB.NET (Ver. 7.6.1.1)
PHP Version 8.1.34 / MySQL 5.7.23-23 / Apache 2.4.67
2007 Content Rulez Contest - Hon Mention
UBB.classic 6.7.2 - RIP