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
- Any Control Panel
- Any OS
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 whitelist ip add 18.104.22.168
# imunify360-agent create-rbl-whitelist
The connectivity issue in this case is cause by the server's security policy.
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