Certbot Failure to Install ssl on my domain

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My domain is: ems-staging.tm30.net

I ran this command: sudo certbot --apache -d ems-staging.tm30.net

It produced this output:
Waiting for verification...
Challenge failed for domain ems-staging.tm30.net
http-01 challenge for ems-staging.tm30.net
Cleaning up challenges
Some challenges have failed.


  • The following errors were reported by the server:

    Domain: ems-staging.tm30.net
    Type: connection
    Detail: Fetching
    Timeout after connect (your server may be slow or overloaded)

    To fix these errors, please make sure that your domain name was
    entered correctly and the DNS A/AAAA record(s) for that domain
    contain(s) the right IP address. Additionally, please check that
    your computer has a publicly routable IP address and that no
    firewalls are preventing the server from communicating with the
    client. If you're using the webroot plugin, you should also verify
    that you are serving files from the webroot path you provided.

My web server is (include version): Apache

The operating system my web server runs on is (include version): Linux Centos Distribution

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know): Yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 1.11.0

Have you checked this part of the possible issues? Port 80 from your side does not answer to SYNs from my vantage point. Anyone one the internet should be able to connect to port 80 on your server in order to pass http-01 challenge.

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