Site is not accesible: Unable to connect / connection timed out / This site can’t be reached

Leonardo Neissinger Soares

Updated February 20, 2026 16:07

Plesk for Windows Plesk for Linux kb: technical ABT: Group B

Applicable to:

Plesk, 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

There are no log entries tied to public IP address that has initiated the website access attempt in the web server logs

MXToolBox TCP Port Status tool and nmap say that ports 80/443 are filtered

# nmap 203.0.113.2 -p 80,443
PORT STATE SERVICE
80/tcp filtered http
443/tcp filtered https
The domain resolves to the right Plesk Server IP address

# dig +short example.com
203.0.113.2
cURL requests from inside the server work

# curl -I http://example.com/
HTTP/1.1 200 OK

# curl -I http://example.com/
HTTP/1.1 301 Moved Permanently
cURL requests from outside the network fail

# curl -I http://example.com
curl: (7) Failed connect to example.com:80; Connection timed out

Ports 80 or/and 443 for the public IP address of the server are blocked by a firewall:

# nmap 203.0.113.2 -p 80,443
PORT STATE SERVICE
80/tcp filtered http
443/tcp filtered https

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 internal 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.