Fuck me dead, what a giant piece of shit. On my Linux work laptop I have the problem that some unknown snakeoil “security” junk is dropping any IPv4 connections to ports 80 and 443. All other ports and IPv6 seem unaffected. I get an immediate “connection refused” when trying to estabslish a connection.

I had this problem four weeks ago on Friday morning the very first time at home. On Thursday evening, everything was perfectly fine. Eventually, I plugged in the LAN cable in the office and everything got automatically fixed. Nobody can explain what’s happening.

Then, last week Friday morning out of the blue, the same issue was back. So, I went to the office yesterday and it got fixed again by plugging in the network cable. This evening, I have exactly the same bloody problem again.

What the hell is going on? Does anyone have any ideas? I’m certainly not an expert, but I don’t see anything suspicious in iptables or nft rules. I also do not see anything showing up in /var/log/kern.log. Even tried to stop firewalld, flush the iptables and nft rules, but that didn’t result in any changes.