Well, now I feel stupid. I finally figured out why, since upgrading to Debian 13/trixie, there are some websites I couldn't connect to, but only over IPv6, they work fine on their IPv4 address.

Fucking MTU.

I'd for a long time had an IPv4 iptables rule to force the MSS (maximum segment size) on outbound packets to `1400`. But I never put in an equivalent for IPv6.

I use 'jumbo packets' on the LAN between desktop and server, which means an MTU of 4088 (for that pair of NICs). So anything forwarded out was using an MSS of 4088 as well.

The issue only showed up for *some* sites, and only for IPv6, and only on 13/trixie because:

1. 13/trixie uses openssl 3.x, not the older version, which has slightly different cipher suites etc in the default config.
2. IPv6 addressing makes packets that little bit bigger.
3. I've only ever observed the issue with MS Azure/Edge hosts.

What was happening was that the first part of the "Server Hello" after a "Change Cipher Spec, Client Hello" from my end was being lost, as the TCP level packet was too large and fragmented... but the first fragment was too large for my PPP link.

So, added an ip6tables rule to do the set-mss thing as well, and now it works.

#Linux #IPv6 #MTU #MSS #openssl #msedge #azure

Any recommendations on a specific #Linux #WebBrowser? I'm a long time #Firefox user, but it's having constant memory leaks that are causing me major slowdowns in my work.

I mainly just want a good vertical tab browser. I normally would use #MSEdge as my fallback, but it's having a weird flickering bug that keeps unfocusing my cursor when inspecting.

I'm currently stranded on #Chrome Unstable.

WARNING: Updating Microsoft Edge browser on Linux overwrites Microsoft repository for apt/rpm/dnf to point to Google Chrome repo, a non-functional config change that will also prevent future updates to automatically fix the issue!

I have seen this issue starting Friday 13-Feb-2026 on several of my own Linux machines with Microsoft Edge installed, when upgrading from v144.x to v145.

https://www.reddit.com/r/MicrosoftEdge/comments/1r4rph8/fedora_linux_microsoftedgerepo_file_getting/

Worse, it looks like this is a known issue reported more than a month ago in the Microsoft forums, and instead of fixing the issue this issue has been promoted (intact) from Edge Dev channel to Stable as of last week.

https://techcommunity.microsoft.com/discussions/edgeinsiderdiscussions/latest-edge-dev-deb-installer-installs-google-repo/4484650

#msedge #microsoft #linux

Securing the Future: Changes to Internet Explorer Mode in Microsoft Edge

https://microsoftedge.github.io/edgevr/posts/Changes-to-Internet-Explorer-Mode-in-Microsoft-Edge/

#edge #msedge #ie #browsers #security #webdev

Who has successfully installed #MSEdge on #fedora42 ?

royal@pippin:~$ sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
Place your finger on the fingerprint reader
royal@pippin:~$ sudo dnf config-manager addrepo --from-repofile=https://packages.microsoft.com/yumrepos/edge
https://packages.microsoft.com/yumrepos/edge 100% | 285.0 B/s | 608.0 B | 00m02s
Error in configuration file "/etc/yum.repos.d/edge.repo.TYn0zN"
Missing section header on line 2

#fedora #linux #linuxDesktop #dnf5 #microsoft #edge