Whole server blocked

Support
1

I run two servers, each with its own shared IP address.

Today I noticed in MainWP that all the websites from one server won’t connect.

So I raised a Support ticket with the hosting company and wrote the following;

All of my sites on this reseller server have suddenly started refusing connections on port 443 from my management server. I suspect my management server’s IP has been blocked by the server firewall (CSF/Imunify360) or is tripping a ModSecurity rule.

Could you please check the firewall and unblock/whitelist my management server IP?

They replied;
Looking into this one, I cannot see any blocks for that IP address on either the server firewall or our hardware firewall.

I have also checked for any modsec rules that were being triggered; there are a few on the server, but none are triggered by this IP address.

So what question should I be asking to resolve this? Is this a server problem, or is it a MainWP problem?

2

Hey @Foxie

This sounds like a networking issue, not a MainWP-specific one.

What error message do you see in the MainWP Dashboard when you try to reconnect these sites?

See if you can find any logs with the MainWP Dashboard’s user agent: What port and User Agent does MainWP use? - MainWP Documentation

3

Hi Bojan,

The error message when try to reconnect is;
HTTP error - Failed to connect to barbutoconstructions.com.au port 443: Connection refused

Then everything resolved…

I think this may have been this issue;
MainWP had aggressively cached a “Connection Refused” error from a previous temporary network blip and simply refused to re-initiate the handshake