A delay might be noticed on the routing of messages between Domino and Exchange and the following entries might be logged in the CMN_ERROR.log file:
2010-02-04 14:04:06,460 INFO CMN.logging [932] - [796] Router closed. Open Sockets: 0
2010-02-04 14:04:07,382 INFO CMN.logging [932] - Connection from 10.1.100.1:4732
2010-02-04 14:04:07,398 INFO CMN.logging [932] - [797] Established channel from Domino(10.1.100.1:4732) to Exchange(10.1.95.10:25). Total Channels: 2
2010-02-04 14:04:07,398 INFO CMN.SmtpProtocol.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Read: 452 4.3.1 Insufficient system resources2010-02-04 14:04:07,398 WARN CMN.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Received response (452 4.3.1 Insufficient system resources) from command (None) router state (PassThrough)
2010-02-04 14:04:07,398 INFO CMN.SmtpProtocol.logging [932] - [797](2476)orig<-dest(2492)[10.1.100.1:4732]<-[10.1.95.10:25]: Write: 452 4.3.1 Insufficient system resources2010-02-04 14:04:07,398 ERROR CMN.logging [932] - [797](2476)orig-^dest(2492)[10.1.100.1:4732]-^[10.1.95.10:25]: Socket closed during command (None). Router state (PassThrough)
At the same time there might be entries similar to the following in the Domino router log:
04/02/2010 14:20:35 Router: No messages transferred to CMNHOST.DOMAIN.COM (host CMNHOST.DOMAIN.COM) via SMTP: SMTP Protocol Returned a Transient Error
The MSExchangeTransport service temporarily stops delivering messages and rejects incoming SMTP connections from the CMN host if the Hub Transport server is running low on disk space and/or memory resources. As soon as resource utilization returns to normal, message delivery continues.
The Application eventlog might show Event ID 15002 from MSExchangeTransport, saying that the "[...] resource pressure is constant at High." The Exchange 2007 Back Pressure feature is responsible for this behavior.
Microsoft TechNet (http://technet.microsoft.com/en-us/library/bb201658(EXCHG.80).aspx) states:
"Hub Transport Servers
For a medium level of resource utilization on a Hub Transport server:
For a high level of resource utilization on a Hub Transport server:
The limit for free disk space depends on the Service Pack level of the Exchange Server 2007. Without any Service Packs the Transport Service on Exchange Server 2007 requires 4GB of
This behavior is environmental and not related to Coexistence Manager for Notes.
Resolution 1:
It is necessary to ensure that the Exchange Hub Transport server has sufficient resources allocated. Alternatively, this article describes how the default values for the high, medium, and normal levels of hard disk drive utilization:
http://technet.microsoft.com/en-us/library/bb201658(EXCHG.80).aspx (please see section: "Monitoring the Free Hard Disk Drive Space for the Message Queue Database")
Resolution 2:
Ensure the Exchange Server has sufficient RAM to perform tasks needed for the user base. Contact Microsoft Support for assistance with ensuring the server has proper system resources.
