5 min
Fix "proxy_lock refused proxy backend" errors on Plesk 18.0.82
Plesk 18.0.82 Update 2 and 18.0.81 Update 7 add mod_proxy_lock, which blocks AJP and Unix-socket proxies. How to confirm it and fix it without losing the check.
2026-11-07
5 min
Fix intermittent 502 errors on cPanel webmail service subdomains
Fix intermittent 502 Bad Gateway errors on cPanel webmail, cpanel, and whm service subdomains after a 136 or 138 update, using a two-line Apache include.
2026-10-31
8 min
Fix 502 Bad Gateway on Plesk — nginx, Apache, and PHP-FPM
Diagnose 502 Bad Gateway errors on Plesk from the nginx proxy error log — refused upstreams, saturated PHP-FPM pools, oversized headers, and Apache restarts.
2026-10-09