Try a reboot, or if that doesn't work/you don't want to, and you're feeling bold, go to Control Panel\Administrative Tools\Services, find DNS Client - rightclick, select Stop, then wait for it to stop. Right click it again and start. Then try.
If you still get the same message, your ISP hasn't updated the DNS for xibase.com (which is strange, since xibase.com and otcentral.com are on the same registrar)