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Help tracking down bandwidth issue
I’m not even sure exactly how to describe my issue… I have an Ubuntu 18.04 server running Nginx. About once a month my local computer (also Ubuntu 18.04) seems to get “stuck” with a connection to my DO server. I didn’t notice it this week, and it has used 8GB of combined upload / download to my server. To what? I don’t know.
I use tcptrack, but I only see my server IP and port 443. I don’t know what it’s connected to on my server. At first I though it was my SSH sessions as sometimes they freeze and I close the window, but when I saw port 443 I knew it was a website. I’ve rebooted my local computer multiple times with no effect. Run tcptrack and there is the connection, using 28kb/s up and down.
Today, I did a reload of the Nginx server and my connection immediately showed “RESET” as the state and then disappeared completely. It’s been OK since. I need some help with what to use to actually track down the issue. It’s my server and it happened to me. I could reset Nginx. What if it’s happening to others that connect to my server, or is it during some of my administration? I left my local computer off all day and when I turned it on, the connection persisted. If it’s happening to others and they have no way of resetting the connection. The reason I even know is I’m in the country on very limited bandwidth and got a text notification, otherwise I might not have even noticed. It ends up costing me a small fortune.
Any help in pointing my to how to go about solving this would be appreciated. I’m going to dig through sever logs and see if I can find clues.
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