August, 2004 Archive

Why do I receive time errors when I run the Dcdiag utility?

The time errors might be occurring because the domain controller (DC) isn’t configured with an external time source. You can check the DC’s time-forwarding status by running the command net time /querysntp If the DC isn’t set to query an external Simple Network Time Protocol (SNTP) server or the configured server isn’t available, you can […]

What causes the “Initialization error 0x800A1391 error message that I receive when I access Windows Update?

This error occurs when Windows Update can’t download and install the Windows Update ActiveX component. This problem sometimes occurs when a firewall blocks the download of the component. If you’ve verified that your firewall isn’t causing the error, a possible solution for the problem is to add the following sites to the Microsoft Internet Explorer […]

How do I turn off all the script error warnings in Internet Explorer?

Errors like “document.SelfHostedImage is null or not and object” are refering to the script on the web page that does not conform precisely with what IE expects. To avoid such messages (which don’t do anything useful for you since you could not in any case edit the web page’s script), go to Tools menu, Internet […]

I have an internal firewall between sections of my network. What ports must I open to allow user and computer account authentication?

Basic authentication on a network consists of several steps. First, the client locates a domain controller (DC), which requires DNS connectivity–port 53 on UDP and TCP. Next, the client performs a connectivity test by using a Lightweight Directory Access Protocol (LDAP) Ping–port 389 over UDP. Then, the client uses Kerberos (port 88 via UDP and […]

How can I determine whether my new Global Catalog is ready to service clients

When you enable a domain controller (DC) as a GC, the DC can’t start offering a GC service immediately. If you have multiple domains, the GC has to replicate information from another GC or for other domains before it can start functioning as a GC. By default, the new GC will wait at least 5 […]

When should I manually defragment a domain controller?

An online defragmentation of the Active Directory (AD) database occurs during the (AD) Garbage Collection process that runs every 12 hours by default. This defragmentation optimizes the database’s structure but doesn’t shrink the database’s size. If you’ve deleted a large number of records from AD or, more likely, you’ve disabled a DC as a Global […]

I recently promoted a server to a domain controller (DC), and now my event log reports an SPNEGO (Negotiator) event. What’s causing this error?

If this event (event ID 40960 or 40961) appears only once in the event log, you can ignore it. The error occurs when the File Replication Service (FRS) starts before the directory service. If the error persists, you most likely have a problem with the directory service and should start troubleshooting Active Directory (AD).

How can I determine which domain controllers (DCs) my Microsoft Exchange Server system is using?

Exchange has an internal process called MSExchangeDSAccess Topology Discovery, which runs every 15 minutes and rediscovers the contents of Active Directory (AD). For each DC it discovers, the process runs a series of tests against the DC and selects one or more DCs that contain the information that Exchange requires (i.e, a configuration DC, a […]

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