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  1. N

    Issue undefined symbol: ap_proxy_check_connection

    Reinstalling apache and its modules shouldn't be problem. Have you doublechecked that there aren't any outdated modules installed/active? You should use proxy_fcgi and proxy from the same Debian repository / version as apache.
  2. N

    Issue undefined symbol: ap_proxy_check_connection

    I've removed the package via aptitude purge libapache2-mod-proxy-psa I didn't get any dependency warnings but keep this in mind and make sure that no other (used) packages will be removed.
  3. N

    Issue undefined symbol: ap_proxy_check_connection

    Had the same isssue with the following setup: Plesk Onyx Version 17.8.8 ‪Debian 9.3‬ Apache/2.4.25 These steps solved the problem on my system: Purging an outdated libapache2-mod-proxy-psa (initially installed while using Debian 8.x) Disabling the Apache modules proxy_fcgi and proxy...
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