Troubleshooting Apache error Asynchronous AcceptEx failed on Windows. Learn causes, symptoms, and exact configuration changes to resolve it. Our Live Support Team is always here to help you.

Apache – AH00341: winnt_accept: Asynchronous AcceptEx failed

Apache on Windows is a reliable choice for many developers and businesses, but now and then errors creep in that can halt everything, just like this Apache server not starting in MAMP error. One such problem is the dreaded Asynchronous AcceptExfailed error. This shows up in the Apache error log with the message:

The specified network name is no longer available. : AH00341: winnt_accept: Asynchronous AcceptEx failed.

When this error occurs, Apache may freeze randomly, stop responding for long periods, and connections may reset frequently. In short, it disrupts your server stability and frustrates users. Let’s walk through what causes it and how to solve it (install the Apache web server).

Why this happens

The Asynchronous AcceptEx failed message is usually triggered by conflicts in the Windows network stack. Here are the common reasons:

• A faulty program or driver inserting itself into the Windows network stack.
• Incompatibility between Apache in WAMP 2.4 and Windows Server 2008.
• Antivirus software or firewall interfering with Apache’s ability to accept new connections.
• VPNs or security tools restricting Apache’s access to network ports.
• Corrupted or misconfigured Windows TCP/IP settings.
• Outdated or broken network drivers.

What you can do

Instead of reinstalling everything, Apache provides specific directives you can add to its configuration file. These changes bypass problematic layers and stabilize connections.

First adjustment for Apache 2.4

Add the following lines to <APACHE_HOME>/Apache24/conf/httpd.conf:

AcceptFilter https none

AcceptFilter http none

This tells Apache not to use the default AcceptEx on Windows, which is often the root of the issue.

When working with Apache 2.2

Apache 2.2 uses different parameters. In that version, you need to disable AcceptEx using:

Win32DisableAcceptEx

In addition, also include the following:

EnableSendfile Off

EnableMMAP off

By default, Apache 2.2 has these set to On, which can make the problem worse.

For Apache 2.4 with extra stability

Even though Win32DisableAcceptEx is not available in 2.4, you can achieve the same outcome with these settings:

AcceptFilter https none

AcceptFilter http none

EnableSendfile Off

EnableMMAP off

According to the documentation, the default values are:

AcceptFilter http data

AcceptFilter https data

Changing them to none resolves the Asynchronous AcceptEx failed issue in most cases.

Final recommended configuration snippet

Place the following in your Apache configuration file:

Acceptfilter http None

Acceptfilter HTTPS None

Enablesendfile off

Enablemmap off

This combination works across different versions and ensures Apache doesn’t rely on problematic Windows network calls.

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Conclusion

The Asynchronous AcceptEx failed error is frustrating but not unsolvable. It mainly stems from interference in Windows networking or mismatched defaults in Apache. By updating your configuration with the directives shared above, turning off problematic filters, and ensuring your drivers and security tools are not blocking Apache, you can get your server stable again.

Once these settings are in place, Apache runs without random stalls, long delays, or constant resets. The key is to make these configuration changes and keep your Windows environment healthy.