Apache crashes in an attempt to enable the pagespeed_ap24 module: Can’t locate API module structure pagespeed_ap24_module

Symptoms

• The Google PageSpeed Insights extension is installed in Plesk > Extensions > My Extensions.

• The pagespeed_ap24 Apache module is shown in Tools & Settings > Apache Web Server. 

• In an attempt to enable pagespeed_ap24 Apache module in Tools & Settings > Apache Web Server, the following error is shown:

  PLESK_ERROR: Error: START httpd_modules_ctl –enable pagespeed_ap24 websrvmng: /usr/local/psa/admin/sbin/apache_control_adapter execution failed:
  hostname httpd[26714]: httpd: Syntax error on line 56 of /etc/httpd/conf/httpd.conf: Syntax error on line 78 of /etc/httpd/conf.modules.d/00-base.conf: Can’t locate API module structure pagespeed_ap24_module’ in file /usr/lib64/httpd/modules/mod_pagespeed_ap24.so: undefined symbol: pagespeed_ap24_module hostname kill[26716]: kill: cannot find process “” websrvmng: /usr/local/psa/admin/sbin/apache_control_adapter execution failed

• Apache service cannot be started with a similar error.

Cause

This is the Plesk bug with the ID #PPP-30399, which will be fixed in the next Plesk update releases.

Resolution

Until the bug will be fixed, apply the following workaround:

1. Log in to the server via SSH.

2. Using the vi text editor open the /etc/httpd/conf.modules.d/00-base.conf file.

3. Find and comment the line below by changing it from:

   LoadModule pagespeed_ap24_module /usr/lib64/httpd/modules/mod_pagespeed_ap24.so

   To

   #LoadModule pagespeed_ap24_module /usr/lib64/httpd/modules/mod_pagespeed_ap24.so

4. Save changes.

5. Restart the Apache service to apply the changes:

   # service httpd restart