mod_proxy_http can not be enabled
Solution 1
This might be due to dist-upgrade
. Please check Plesk support articles -
Put this after the other LoadModule directives
LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule rewrite_module /usr/lib/apache2/modules/mod_rewrite.so
Solution 2
Sounds like the problem as described here. To fix:
apt-get purge libapache2-mod-proxy-psa
a2dismod proxy
a2enmod proxy proxy_fcgi
systemctl restart apache2
Related videos on Youtube
Lito
Updated on September 18, 2022Comments
-
Lito almost 2 years
I have the current proxy modules enabled and working fine:
$ apache2ctl -M | grep proxy proxy_module (shared) proxy_fcgi_module (shared)
When I enable
mod_proxy_http
witha2enmod proxy_http
andservice apache2 restart
, apache returns an error as if mod_proxy was not enabled:oct 16 10:55:45 apachectl[15243]: apache2: Syntax error on line 140 of /etc/apache2/apache2.conf: Syntax error on line 2 of /etc/apache2/mods-enabled/proxy_http.load: Cannot load /usr/lib/apache2/modules/mod_proxy_http.so into server: /usr/lib/apache2/modules/mod_proxy_http.so: undefined symbol: ap_proxy_check_connection
ap_proxy_check_connection
is a mod_proxy.h method https://ci.apache.org/projects/httpd/trunk/doxygen/group__MOD__PROXY.html#ga618c0e1bede21bdd3af5d6a802671caeMaybe some problem on module order load?
Thanks.
UPDATE: After add LoadModule mod_proxy before
IncludeOptional
directive, the problem is same.$ vi /etc/apache2/apache2.conf Include /etc/apache2/mods-available/proxy.load Include /etc/apache2/mods-available/proxy.conf # Include module configuration: IncludeOptional mods-enabled/*.load IncludeOptional mods-enabled/*.conf $ apache2ctl -M | grep proxy [Mon Oct 16 11:14:00.205439 2017] [so:warn] [pid 19944] AH01574: module proxy_module is already loaded, skipping proxy_module (shared) proxy_fcgi_module (shared) $ a2enmod proxy_http Considering dependency proxy for proxy_http: Module proxy already enabled Enabling module proxy_http. To activate the new configuration, you need to run: systemctl restart apache2 $ apache2ctl -M | grep proxy [Mon Oct 16 11:14:11.256292 2017] [so:warn] [pid 20006] AH01574: module proxy_module is already loaded, skipping apache2: Syntax error on line 142 of /etc/apache2/apache2.conf: Syntax error on line 2 of /etc/apache2/mods-enabled/proxy_http.load: Cannot load /usr/lib/apache2/modules/mod_proxy_http.so into server: /usr/lib/apache2/modules/mod_proxy_http.so: undefined symbol: ap_proxy_check_connection
-
c4f4t0r over 6 yearsa2enmod proxy && a2enmod proxy_http
-
Lito over 6 yearsSame probem: $ a2enmod proxy && a2enmod proxy_http && service apache2 restart: apache2: Syntax error on line 140 of /etc/apache2/apache2.conf: Syntax error on line 2 of /etc/apache2/mods-enabled/proxy_http.load: Cannot load /usr/lib/apache2/modules/mod_proxy_http.so into server: /usr/lib/apache2/modules/mod_proxy_http.so: undefined symbol: ap_proxy_check_connection
-
c4f4t0r over 6 yearshow did you installed your apache?
-
Lito over 6 yearsIt's a Plesk installation. Enabling http proxy module from Plesk panel the error is the same.
-
c4f4t0r over 6 yearsif you are using any hosting provider, open a ticket with this error "undefined symbol: ap_proxy_check_connection
-
Lito over 6 yearsYes, but it's strange. A google search with "undefined symbol: ap_proxy_check_connection" returns only one result, this question. Thanks anyway.
-