The previous update of Gandanur contained a very annoying bug: At random times clients would get the "server closed down" message while the server was still running. This resulted in random players being "kicked" from the server. Considering this is a serious bug I have spent the last few days debugging it and the cause has been found.
The bug occurred because Gandanur incorrectly handled an obscure error that was thrown by Windows when the server receives an ICMP unreachable packet. Without going in too much detail, some firewalls actually block those packets (and those hosts weren’t affected by this bug), while other firewalls allow this packet (those hosts were affected by the bug). Thanks to several testers the bug is now fixed in version 11.9.1 of Gandanur!