esx.problem.net.firewall.port.hookfailed
Summary
Adding port to firewall failed.
Causes
There is a configuration issue with the network firewall. Adding a port has failed.
Resolutions
See the event description for more detailed information specific to this event. Review firewall and network configuration.
For more information review the VMware KB article.
External
Refer to the VMware Online Documentation for more information on vCenter event messages and possible solutions.