Question

My droplet IP is getting blocked for being "unknown"

I set up Droppy on an Ubuntu 19.10 server to store and access files through an interface. It loads the website when I go on port 8989 (123.123.123:8989), however it gets blocked by Lightspeed Systems only at my school for being “unknown”. Do I need to buy a domain or add an ssl certificate for it to be trusted? How would I access my own server on a network with a strict firewall?

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Accepted Answer

@usernameunlocked I would bet your first intuition around needing a domain name is correct.

I’d recommend:

  1. Buy a domain name (NameCheap has a bunch of the new extensions for as cheap as $2.88/yr)
  2. Point it to DO nameservers
  3. Add the domain in control panel and point it at the Droplet
  4. Use nginx as a reverse proxy on your Droplet so you can map HTTP ports to your internal service’ port 8989 (just in case your school is blocking requests that use non-standard ports)
  5. I doubt it is the cause of the block, but you could also setup Let’s Encrypt to get HTTPS for free

Hope that helps.

When I send the mail to corporate email it’s working, When I send the mail to Gmail then I got an error.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

devthakur8688@gmail.com host gmail-smtp-in.l.google.com [142.250.141.27] SMTP error from remote mail server after end of data: 550-5.7.1 [128.199.8.88] The IP you’re using to send mail is not authorized to 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550 5.7.1 https://support.google.com/mail/?p=NotAuthorizedError a65-20020a636644000000b003a88c036f84si10704333pgc.59 - gsmtp Reporting-MTA: dns; 128-199-8-88.cprapid.com

Action: failed Final-Recipient: rfc822;devthakur8688@gmail.com Status: 5.0.0 Remote-MTA: dns; gmail-smtp-in.l.google.com Diagnostic-Code: smtp; 550-5.7.1 [128.199.8.88] The IP you’re using to send mail is not authorized to 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550 5.7.1 https://support.google.com/mail/?p=NotAuthorizedError a65-20020a636644000000b003a88c036f84si10704333pgc.59 - gsmtp