Some users of Microsoft Internet Explorer or Microsoft Edge may receive the error "Network Error 0x2ef3, Could not complete the operation due to error 00002ef3."
Most modern application servers have a timeout value either equal to or greater than 75 seconds, or a more sophisticated way of handling requests where the timeout depends on their workload.
The default 'keep-alive' timeout interval for Apache Tomcat is 20 seconds. The default for the Apache HTTP Server httpd is only 5 seconds. To prevent network error 0x2ef3 from occurring, this value must be increased to at least 75 seconds.
You may choose to do so using one of the following methods:
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Configure the involved HTTP infrastructure (including the application server, proxies, firewall and load balancer) to set KeepAliveTimeout to 75 seconds.
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Configure the involved HTTP infrastructure (including the application server, proxies, firewall and load balancer) to set KeepAliveTimeout to 75 seconds depending on the user agent (only for Internet Explorer).
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Configure the involved HTTP infrastructure (including the application server, proxies, firewall and load balancer) to selectively turn off KeepAlive for Internet Explorer.
Failure to do so may cause a timeout, resulting in the aforementioned error.
| While we have used Apache as an example here, the error is known to occur with other web servers such as Nginx, too. |