esx.problem.net.uplink.mtu.failed
Summary
VMkernel failed to set the MTU value on the uplink.
Causes
The MTU value may be invalid or incompatible with NICs connected as uplinks.
Resolutions
Check and correct MTU value, if necessary. Refer to this VMware KB article for more information on the issue.
External
Refer to the VMware Online Documentation for more information on vCenter event messages and possible solutions.