ResolveDoc

Root Cause Diagnosis When secondary domains or child vhosts are created in CyberPanel, OpenLiteSpeed/LiteSpeed Web Server (OLS/LSWS) inherits virtual host listener bindings that often lack explicit HTTP/2 protocol declarations or ALPN (Application-Layer Protocol Negotiation) flags. Updating virtual host parameters or toggling SSL via the CyberPanel GUI regularly overwrites custom vhost settings back to default templates, … Read more

Root Cause Diagnosis When aaPanel initializes its Docker Manager plugin, Docker automatically assigns default IP subnets (typically 172.17.0.0/16 or sequentially picked 172.X.0.0/16 blocks) to the default bridge interface (docker0) and custom panel-managed networks. If these automatically generated CIDR pools overlap with existing local host interfaces, LAN ranges, or VPN subnets, the host’s routing table prioritizes … Read more

Root Cause Diagnosis An Apache graceful restart (apachectl graceful or systemctl reload apache2) sends a SIGWINCH signal instructing parent and worker processes to finish active requests before exiting. When worker threads are blocked on non-interruptible I/O operations, deadlocked database connections, or unmanaged C-extension subprocesses (e.g., PHP extensions or mod_wsgi threads), they ignore the graceful shutdown … Read more

Root Cause Diagnosis When MariaDB is upgraded on a CyberPanel server, package updates frequently replace shared C client libraries (such as libmariadb.so or libmariadb3) or change default socket paths and strict SQL modes. CyberPanel’s underlying Python/Django environment relies on these specific database bindings and database schema compatibility to render the login framework. As a result, … Read more

Root Cause Diagnosis Nginx strips or fails to forward the Authorization header during a proxy_pass request when the header contains non-standard characters, when underscores_in_headers is disabled, or most commonly, when multi-tier proxy/rewrite rules clear header buffers. Additionally, if the downstream application expects lowercase header handling or Nginx is configured to drop unhandled headers during subrequests … Read more