Information

Title	OpenEdge Replication regularly reports communication problems in the database log file

URL Name	P181741

Article Number	000153379

Environment	Product: OpenEdge Replication Version: 10.x, 11.x , 12.x OS: Windows

Question/Problem Description

OpenEdge Replication regularly reports communication problems in the database log file.
Replication recovers and synchronises most of the time for all replication target databases.
Replication is unable to reconnect in order to start synchronization every time.
Replication Server establishes connection to it's Replication Agent for some but not all replication enabled pairs on the same primary and secondary machines.

Steps to Reproduce

Clarifying Information

Error Message	(9407) Connection failure for host <host> port <port> transport TCP. (11713) A communications error -4004 in rpCOM_SendMsg. (-----) Diagnostic Dump of RPCommInfo_t - TCP/IP Send Error (10491) A communications error -155 occurred in function rpNLS_SendAIBlockToAgent while sending AIBLOCK. (10661) The Fathom Replication Server is beginning recovery for agent agent1. (10842) Connecting to Fathom Replication Agent agent1.

Error Message

(9407) Connection failure for host <host> port <port> transport TCP.
(11713) A communications error -4004 in rpCOM_SendMsg.
(-----) Diagnostic Dump of RPCommInfo_t - TCP/IP Send Error
(10491) A communications error -155 occurred in function rpNLS_SendAIBlockToAgent while sending AIBLOCK.
(10661) The Fathom Replication Server is beginning recovery for agent agent1.
(10842) Connecting to Fathom Replication Agent agent1.

Defect Number

Enhancement Number

Cause

TCP Offloading is enabled on the network adapter, known to cause various types of networking faults.
RSS-enabled NICs lack a critical data steering mechanism that steers incoming network data to the same core on which its application process resides

Resolution

Tune the Network Adapter on both the primary and secondary servers:

1. Disable TCP Chimney or any of its variants (eg. TCP Segment Offload).
2. Disable Receive Side Scaling

For further information refer to Article Intermittent performance degradation for remote clients connected to databases when Windows TCP/IP features are enabled

Consult MicroSoft Support and the site Network Administrator for further assistance as required.

Workaround

Notes

References to Other Documentation:

Non-RSS Receive Processing
https://docs.microsoft.com/en-us/windows-hardware/drivers/network/non-rss-receive-processing

Progress Article:

Significant batch job performance drop once replication is enabled

Keyword Phrase

Last Modified Date	2/5/2021 12:53 PM