Cobra Forum

Applicable to:

• Plesk Onyx for Linux
• Plesk for Linux

Symptoms

• Apache service fails to start with the following errors:

Can't locate API module structure `proxy.plesk_module' in file /usr/lib64/httpd/modules/mod_proxy.plesk.so: /usr/lib64/httpd/modules/mod_proxy.plesk.so: undefined symbol: proxy.plesk_module
Cannot load /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so into server: /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so: undefined symbol: proxy_module

Cause

Corresponding modules are present in the Apache configuration file twice under different names:

mod_proxy_fcgi.so and mod_proxy_fcgi.plesk.so

mod_proxy.so and mod_proxy.plesk.so


Resolution

1.Connect to the server via SSH

2.Find the configuration file from where these modules are loaded:

# egrep -R 'mod_proxy.plesk|mod_proxy_fcgi.plesk' /etc/httpd/
/etc/httpd/conf.modules.d/00-base.conf: LoadModule proxy.plesk_module /usr/lib64/httpd/modules/mod_proxy.plesk.so
/etc/httpd/conf.modules.d/00-base.conf: LoadModule proxy_fcgi.plesk_module /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so
3.Edit /etc/httpd/conf.modules.d/00-base.conf and comment out above lines with a preceding "#":

#LoadModule proxy.plesk_module /usr/lib64/httpd/modules/mod_proxy.plesk.so
#LoadModule proxy_fcgi.plesk_module
/usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so
4.Repair configuration files:

# plesk repair web -y

5.Start apache if required:

#service httpd start