All websites hosted on Plesk server are inaccessible: Failed to switch to Apache: This may be due to a configuration error.

Symptoms

• All websites hosted on Plesk server are inaccessible

• Unable to switch web sites to Apache in the LiteSpeed extension with the following error:

  PLESK_ERROR: Failed to switch to Apache! This may be due to a configuration error. To manually check this problem, please ssh to your server. Use the following steps to manually switch to Apache: Stop LiteSpeed if lshttpd still running: killall -9 lshttpd Try stop LiteSpeed if lshttpd still running: killall -9 lshttpd Restore Apache httpd if /usr/sbin/httpd_ls_bak exists: mv -f /usr/sbin/httpd_ls_bak /usr/sbin/httpd Run the Apache restart command manually: service httpd restart and check for errors.

Cause

The LiteSpeed extension failed to switch web sites to Apache. As result Apache got down and LiteSpeed was not completely disabled.

Resolution

1. Connect to the server via SSH

2. Kill all LiteSpeed processes:

   # killall -9 litespeed

3. Restore original Apache service configuration:

   # unlink /usr/lib/systemd/system/httpd.service
   # cp -a /usr/lib/systemd/system/httpd.service.ls_bak_bak /usr/lib/systemd/system/httpd.service
   # systemctl daemon-reload

4. Start Apache manually:

   # service httpd restart