When attempting to enter maintenance mode:
From vCenter:
A general system error occurred: Connection reset by peer: The connection is terminated by the remote end with a reset packet. Usually, this is a sign of a network problem, timeout, or service overload.
Command line running:
esxcli system maintenanceMode set --enable true
I receive the error:
A general system error occurred: Broken pipe: The communication pipe/socket is explicitly closed by the remote service.
VMware ESXi, 6.7.0, 10764712
vCenter
And vCenter:
Happening on two different clusters.