Error When Installing Let'sEncrypt on Forge!

Hello Devs,

I am trying to install SSL certificate for my domain. I believe The DNS is well set-up as I can already point to it without and interact the web app. I want to install Let'sEncrypt using Forge and I seem to receive the error message below each time I make an attempt:

Creating well known challenge directory...
Installing LetsEncrypt client...
Cloning into 'letsencrypt1512123943'...
Configuring client...
Restarting Nginx...
Generating Certificate...
# INFO: Using main config file /root/letsencrypt1512123943/config
+ Generating account key...
+ Registering account key with ACME server...
+ Done!
# INFO: Using main config file /root/letsencrypt1512123943/config
Processing example.com with alternative names: www.example.com
 + Signing domains...
 + Creating new directory /root/letsencrypt1512123943/certs/example.com ...
 + Creating chain cache directory /root/letsencrypt1512123943/chains
 + Generating private key...
 + Generating signing request...
 + Requesting challenge for example.com...
 + Requesting challenge for www.example.com...
 + Responding to challenge for example.com...
ERROR: Challenge is invalid! (returned: invalid) (result: {
  "type": "http-01",
  "status": "invalid",
  "error": {
    "type": "urn:acme:error:connection",
    "detail": "Fetching http://example.com/.well-known/acme-challenge/DP-X2o8KGTnUDNgycWnouVDO3JhV7prBIBjQB-696KU: Timeout",
    "status": 400
  },
  "uri": "https://acme-v01.api.letsencrypt.org/acme/challenge/rEdBDDjTfyhRnUl7jiU6NDeIKWEPWANBU2yk313BYcs/2613126403",
  "token": "DP-X2o8KGTnUDNgycWnouVDO3JhV7prBIBjQB-696KU",
  "keyAuthorization": "DP-X2o8KGTnUDNgycWnouVDO3JhV7prBIBjQB-696KU.pDV6oTqyr2UKORyABNlWDWGzSK9gEcSG2S7elZInOWQ",
  "validationRecord": [
    {
      "url": "http://example.com/.well-known/acme-challenge/DP-X2o8KGTnUDNgycWnouVDO3JhV7prBIBjQB-696KU",
      "hostname": "example.com",
      "port": "80",
      "addressesResolved": [
        "46.101.56.116",
        "2a03:b0c0:1:d0::30ec:a001"
      ],
      "addressUsed": "2a03:b0c0:1:d0::30ec:a001",
      "addressesTried": []
    }
  ]
})