Server subnet mask changed without my input


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I was recently trying to get onto my server and the web gui was not working. I was able to ping the server but unable to get to it. I finally got the crashcart out and it seems to be running and dockers are running as expected. Did a reboot same thing. I then found my subnet mask changed without me knowing. What would have caused this if I have a static IP setup for this sytem? I have a log file but is there a setting I need to change to prevent this in the future?

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