api.ww.wp.xz.cn timeout only from one specific server IP

Hello,

I am experiencing a connectivity issue with ww.wp.xz.cn infrastructure from only one specific server IP.

Server environment:

• AlmaLinux 8.10
• Plesk

Problem:
The server cannot connect to:

• api.ww.wp.xz.cn
• ww.wp.xz.cn
• downloads.wp.xz.cn

As a result, the WordPress Plugins page shows:

“An unexpected error occurred. Something may be wrong with ww.wp.xz.cn or this server’s configuration.”

Tests performed:

1. Direct connection from primary server IP:

• curl https://api.ww.wp.xz.cn
• timeout

2. Direct connection to ww.wp.xz.cn 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.ww.wp.xz.cn

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 ww.wp.xz.cn infrastructure.

Could you please verify whether this IP address or its network is being filtered by ww.wp.xz.cn infrastructure?

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

Thank you.

• This topic was modified 2 days, 19 hours ago by owerer.