We have recently started having a problem with our SAP system sending large volumes of IDocs to the SAP Adapter Listener. The problem is that SAP starts to send the IDocs to the adapter OK but at some point SAP seems to lose connection to the listener and stops sending. This then causes severe performance issues in SAP as all the tRFC queues fill up. Testing the RFC destination in SAP at this point returns a connection error.
On checking the connection in the SAP adapter the connection and the listeners all look OK - both the connection and the listeners are still showing as enabled. There are no errors in the error log and nothing obvious in the server log even at Trace level logging.
The resolution has been to disable all SAP adapter listeners and re-enable them. The listeners always disable and enable successfully on the adapter, but we sometimes need to repeat this exercise a couple of times before the RFC destination in SAP tests OK and the IDocs start transmitting again.
I am not wholly convinced, at this stage, that this is a wM issue and the issue may be in SAP but I need to know if anybody has any ideas of where to check both in wM and in SAP in order to diagnose and resolve this problem.
We are using Integration Server 8.2.2 with SAP Adapter 7.1 (fix 10 applied).
Many thanks in advance for your help.