Website displays an error 502: AH01075: Error dispatching request to : (polling)

[Suhitha]

Question: Website displays an error 502: AH01075: Error dispatching request to : (polling)


Applicable to:

• Plesk for Linux

Symptoms

• The website example.com uses a PHP script and shows a 502 Bad Gateway error when opened via a browser.

The following error is recorded in Domains > example.com > Logs or in /var/www/vhosts/example.com/logs/error_log file when reproducing the issue:

Code Select Expand

AH01075: Error dispatching request to : (polling)

Cause

The website's PHP code is taking too long to execute and exceeds the currently configured default timeout limit.


Resolution

Increase the PHP timeout limits:

1. Log into Plesk

2. Go to Domains > example.com > Dashbord > PHP

3. Set higher values for max_execution_time, max_input_time and memory_limit, for example:


       
       
max_execution_time = 800
max_input_time = 1600
memory_limit = 512M
Note: Increase them even further if necessary