Microsoft KB Archive/247764

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XFOR: Testing POP3 Through Telnet Does Not Work, Generates Event 13003

Article ID: 247764

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q247764


When you attempt to test Post Office Protocol (POP3) on Microsoft Exchange Server 5.5 through telnet, the connection may not succeed and the following event may appear in the application log of Event Viewer:

Event ID: 13003
Source: MSExchangePOP3
Type: Error
Category: Authentication
Description: Hr lookup credentials () call failed with error logon failure. Unknown user name or bad password.


This behavior can occur when Exchange Server services, the Exchange service account, or both lack the necessary permissions and rights.


To resolve this issue, make sure that the Exchange service account has all container level permissions and all necessary user rights in User Manager for Domains. Also, make sure that all Exchange services start by using the service account. Follow these steps:

  1. In Exchange Administrator, make sure the Exchange service account has permissions at the site, configuration, and server levels.
  2. In Control Panel, double-click Services and make sure all Exchange services start by using this account:
    1. Select an Exchange service, and then click Startup.
    2. Make sure that Log On As is selected, and that the Exchange service account is listed.
  3. In User Manager for Domains, make sure that this account has the following user rights:
    • Act as part of the operating system
    • Log on as a service
    • Log on locally
    • Restore files and directories
  4. Stop the information store, and then restart it.
  5. To test the new configuration, use telnet to connect to port 110.


For additional information about using telnet, please see the following article in the Microsoft Knowledge Base:

165186 XFOR: Verifying Basic POP3 Connectivity Using Telnet

Keywords: kbprb KB247764