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Largest Delivery Queue Length - sustained for 5 minutes - Red(>250) - Edge Transport

 

Topic Last Modified: 2007-11-16

The Microsoft Exchange Server 2007 Management Pack for Operations Manager includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange Server 2007. For this Operations Manager rule, data is collected using the performance counter specified in the Details table.

To review the value of the performance counter that generated this alert, do one of the following:

  • If you are using Microsoft Operations Manager 2005, from the Operator Console, select this alert, and then click the Properties tab. Review the description of the alert that includes the variables specific to your environment.

  • If you are using System Center Operations Manager 2007, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.

Details

Product Name

Exchange

Product Version

8.0 (Exchange Server 2007)

Event Source

MSExchangeTransport Queues

Counter Name

Largest Delivery Queue Length

Instance Name

_Total

Sample Interval (in seconds)

60

Server Role

Ex. Edge Transport

Critical Error Threshold

>250

MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Edge Transport/Transport

MOM Rule Name

Largest Delivery Queue Length - sustained for 5 minutes - Red(>250) - Edge Transport.

Explanation

The Largest Delivery Queue Length performance counter represents the number of e-mail messages that are queued to a given Exchange Hub Transport server or Edge Transport server.

This alert indicates that Largest Delivery Queue Length has exceeded 250 messages for five minutes. When this value is high, the server cannot establish a SMTP session to the other Hub Transport or Edge Transport server. Other symptoms you may experience when this threshold is reached are reduced intra-site, inter-site, and external mail flow. This alert may be caused by one or more of the following conditions:

  • Problem with a specific Hub Transport server or Edge Transport server. For example, one or more required services may not be running.

  • Issues with network connectivity, routers, or firewalls.

User Action

To resolve this alert, do one or more of the following:

  • Run the Microsoft Exchange Mail Flow Troubleshooter. To access the Mail Flow Troubleshooter, click Toolbox in the Exchange Management Console.

  • Use the Nslookup command-line tool to verify that external or remote domains have valid mail exchanger (MX) records.

  • Use Telnet to verify that external or remote domain mail exchangers respond to telnet to port 25. For more information, see How to Use Telnet to Test SMTP Communication.

If you are unable to identify and resolve the problem and if the Largest Delivery Queue Length performance counter continues to increase, contact Microsoft Technical Support. For information about how to contact support, visit the Contact Us page of the Microsoft Help and Support Web site.

For More Information

To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Microsoft Help and Support Web site.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.