RPC responses should have the INTERNAL flag cleared --------------------------------------------------- Key: JGRP-1940 URL: https://issues.jboss.org/browse/JGRP-1940 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Fix For: 3.6.5 When an RPC request is retransmitted, it will be sent by {{NAKACK2}} or {{UNICAST3}} as {{INTERNAL}} message. If the RPC call returns a response, that response will also be {{INTERNAL}}, using up the internal thread pool. SOLUTION: clear the {{INTERNAL}} flag on an RPC response. JGroups uses the {{INTERNAL}} flag only with *messages*, never with *RPCs*.