Symptoms
The Plesk Panel, a website, or webmail can't be reached and returns a browser error
Unable to connect
Your Internet access is blocked ERR_NETWORK_ACCESS_DENIED
This site can’t be reached
example.com took too long to respond
ERR_CONNECTION_TIMED_OUT
The connection has timed out
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Cause
Ports 80 or/and 443 are blocked by a firewall.
Resolution
Open the web ports 80 and 443 on the firewall.
Note: If the issue persists, contact the ISP, hosting provider, or network administrator for assistance locating and opening the block.
- To automatically configure the external firewall to allow all necessary connections, use Plesk Firewall. Additional software (like Imunify360) must also be configured according to its documentation.
- For external firewalls, follow the appropriate guide (contact the hosting provider if not listed): Amazon EC2, Lightsail, Google Cloud, Azure, Alibaba Cloud.