Apache fails to start: undefined symbol: ap_set_content_type_ex

[Suhitha]

Question: Apache fails to start: undefined symbol: ap_set_content_type_ex


Applicable to:

• Plesk for Linux

Symptoms

• Apache fails to start with an error like this one:

Code Select Expand

Cannot load /usr/lib/apache2/modules/mod_headers.so into server: /usr/lib/apache2/modules/mod_headers.so: undefined symbol: ap_set_content_type_ex

• LiteSpeed is/was installed on the server

Cause

Incorrect package configuration from LiteSpeed.


Resolution


Reinstall Apache

1.Connect to the server over SSH

2.Reinstall the Apache components

RHEL-based

Code Select Expand

# yum reinstall httpd

Debian-based

Code Select Expand

# apt reinstall apache2 apache2-bin apache2-data apache2-utils
3.Start Apache

Code Select Expand

# systemctl start httpd || systemctl start apache2

Related to

Apache