Can't access certain web sites

I’m unable to access certain web sites. This came out of nowhere and I can’t figure out what is going on. I have an instance of NextCloud on a VPS and yesterday I was syncing my data between NextCloud and my Linux Mint desktop as well as my Mac desktop.

Both machines are next to eachother in my office. They are both on the same network and I’ve tried them both on wifi as well as wired connections.

I am able to access my NextCloud instance from my Mac without issue. Can’t get to it from the Linux box. I was able to get to NextCloud from the Linux box the better part of the day and then out of nowhere I can no longer get to it.

I’ve tried rolling bac to 20.3 from 21 but that didn’t make a difference. I’ve rebooted my modem. I’ve even hard coded my DNS servers. Nothing seems to work.

Any help would be very much appreciated.