Wordpress cURL error 28: Failed to connect

Issue

cURL error 28 is pervasive within WordPress with imunify360 enabled and giving the below error:

Error: Unable to connect to the remote server (cURL error 28: Failed to connect to domain.com port 443 after 5002 ms

Environment

• Imunify360
• Any Control Panel
• Any OS

Solution

Check if the IP's country is blacklisted. If it is, whitelist the specific IP to bypass country blocks by running the following commands:

# imunify360-agent ip-list local add --purpose white 111.222.33.44
# imunify360-agent create-rbl-whitelist

Cause

The connectivity issue in this case is caused by the server's security policy.

Useful links

• https://docs.imunify360.com/command_line_interface/#whitelist 
• https://docs.imunify360.com/dashboard/#firewall