We are operating some guest OS' (Windows Server 2012 R2 Standard ) on ESXi 5.5U1, and about 150 .NET applications are working on each guest OS.
But, the following error occured intermittently when the .NET application communicate another client.
"An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full."
So, we took actions below, but all failed.
a. TCP parameter modification
TcpTimedWaitDelay - 30
MaxUserPort - 65534
TcpNumConnections - 16777214
TcpMaxDataRetransmissions - 5
b. IPv6 disable
c. OS memory extension: 8GB → 16GB
d. NIC change: E1000 → VMXNET3
We would appreciate your help.
Justin, were you able to resolve this issue and if so what was the resolution?
We are running into the same issue on our primary application server.