Mirroring Automatic Failover

We are receiving the below Error message in Mirroring and principal server is failovering automatically to Mirror Server.

Database mirroring connection error 4 'The connection was closed by the remote end, or an error occurred while receiving data: '64(The specified network name is no longer available.)''

Database mirroring connection error 4 '10054(An existing connection was forcibly closed by the remote host.)'.

Database mirroring connection error 2 'Connection attempt failed with error: '10060(A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)'.'

I have verified telnet to mirroring ports which is working from both sides.

Any thoughts?