My webserver is getting blocked by corporate firewalls

I host a science community forum on an Ubuntu droplet. Unfortunately this server is getting blocked by corporate firewalls (

The reason for the blacklisting is listed as “online-storage-and-backup”.

Is there any possible way to alleviate this?

Thanks in advance Zeno


That’s really frustrating. I’m guessing you’ve already gone to the corporation and asked them to whitelist your site, I know that can often result in a dead end.

I’m curious whether the corporate firewall is blocking by domain, IP address, or content. (I’d be surprised if it’s content, because it looks like you’re using HTTPS)

Here are some debugging tips that might help you zero in on how they’re flagging the site:

  1. Is your root domain also blocked? The root domain points to a different IP, if it is blocked, they might just be blocking your entire domain.

  2. If you have another domain, point it at the droplet (or use an nginx reverse proxy to point at the droplet) and see if that also gets blocked.

  3. If you think it might be by IP, (which I doubt), take a snapshot of your droplet, create a new one (which will have a different domain) and try pointing your dns at the new droplet.

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Thanks for the response.

Yeah, unfortunately I already tried with them, but since I’m not a direct customer (my workplace is) I’m not even able to put in a request.

Following your logic, it seems to be the domain that’s blocked. Thanks for leading me to that conclusion.

I’ll bug some people elsewhere :-)