You experience delays when you try to log on to Exchange Server 5.5

Consider the following scenario. You experience delays when you try to log on to Microsoft Exchange Server 5.5. Then, you use the Performance Monitor to view a Thread Count counter. The Thread Count counter is for the Local Security Authentication Server (LSASS) process on the computer that is running Exchange Server 5.5. When you view the Thread Count counter, you may notice that the thread count for the LSASS process continues to increase.

The delay occurs because of the time that the information store thread spends looking up an account security identifier (SID) in the Active Directory directory service.

To resolve this problem, install the following update rollup or hotfix. After you install the update rollup or the hotfix, the information store thread first looks up the SID in the LSASS. If the information store thread cannot locate the SID in the LSASS, the information store thread then searches Active Directory.

Update rollup information

Obtain the November 2004 Update Rollup for Exchange Server 5.5.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Exchange Server 5.5 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.Note Because of file dependencies, this update requires Microsoft Exchange Server 5.5 Service Pack 4 (SP4). For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in Microsoft Exchange 5.5 Server.