After an upgrade from ESX/ESXi 4.1 to ESXi 5.0, your monitoring department are reporting that they have stopped receiving Syslog data from all of the ESXi hosts. What could be the problem?
Tech Support Mode is disable by default after an upgrade to ESXi 5.0 stopping all traffic on all ports
Custom ports that were opened by using the ESX/ESXi 4.1 esxcfg-firewall command do not get copied during the upgrade to ESXi 5.0.
ESXi 5.0 cannot send logs to Syslog servers.
Custom ports that were opened by using the ESX/ESXi 4.1 esxcfg-firewall command do not remain open after the upgrade to ESXi 5.0