Troubleshooting Vmware ESXi migration issues

While trying to install ESXi 4.0 U4 to my hosts, I started experiencing these errors:

• "A general system error occurred: Migration failed while copying data, Broken Pipe"


• "A general system error occurred: Failed to start migration pre-copy. Error 0xbad010d. The ESX hosts failed to connect over theVMotion network. "

attempting the put a host in maintenance mode. The VMs would not failover to another host.

Anyway, the fix was #2 under resolution in the link below. Basically, set Migrate.Enabled setting on all hosts to 0, then back to 1. After done on all hosts, the vMotion started working again.

Weird.

Reference:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1036083