An operation on a socket co… |VMware Communities

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
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters]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.

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