api.wordpress.org timeout only from one specific server IP

Hello,

I am experiencing a connectivity issue with WordPress.org infrastructure from only one specific server IP.

Server environment:

• AlmaLinux 8.10
• Plesk

Problem:
The server cannot connect to:

• api.wordpress.org
• wordpress.org
• downloads.wordpress.org

As a result, the WordPress Plugins page shows:

“An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration.”

Tests performed:

1. Direct connection from primary server IP:

• curl https://api.wordpress.org
• timeout

2. Direct connection to WordPress.org IPs:

• 198.143.164.251 -> timeout
• 198.143.164.252 -> timeout

3. Firewall investigation:

• firewalld temporarily disabled
• same timeout result
• no CSF installed
• OUTPUT policy ACCEPT

4. Connectivity to other websites:

• google.com -> OK
• github.com -> OK
• cloudflare.com -> OK
• wordpress.com -> OK

5. Important finding:
   The same server has additional public IP addresses.

Using another IP on the SAME server:

curl –interface [secondary IP] -I https://api.wordpress.org

Result:

HTTP/2 302

This means:

• Same server
• Same operating system
• Same gateway
• Same firewall
• Same network interface

Only one specific public IP cannot reach WordPress.org infrastructure.

Could you please verify whether this IP address or its network is being filtered by WordPress.org infrastructure?

The affected IP address can be provided privately to moderators or infrastructure staff if required.

Thank you.

• This topic was modified 3 days, 23 hours ago by owerer.