Maximum connection reached exception in TCP Gateway

Hi,

We are passing outbound data from PI to Client Target system, in between we have an another server, where TCP Gateway Tool runs and data flows happens from PI->Gateway->Client Target server.

Message flow is normal and suddenly we are getting an 'java.net.socketException: No buffer space availble' in TCP Gateway . When i restart the gateway, again message flow is getting normal.

Kindly advice on the issue.