add and publish new post about the conservative firewall setting to not break ssh connections

content/posts/2024/70-stalled-ssh-connections/index.md

@@ -0,0 +1,32 @@
+---
+title: Stalled SSH connections
+summary: >
+  My firewall removed valid connections obviosly.
+  This is how I solved it.
+date: 2024-10-06T19:30:17+02:00
+# lastmod: 2024-08-18T14:20:52+0000
+categories:
+  - computerstuff
+tags:
+  - networking
+  - pfSense
+  - openssh
+  - selfhost
+---
+
+I spent some time adjusting my SSH configuration because I often get stalled
+connections to my servers but I never got that fixed until recently, when I
+started looking in my firewall settings on the pfSense.
+
+After changing the <kbd>Firewall Optimization Settings</kbd> within
+<kbd>System</kbd> → <kbd>Advanced</kbd> → <kbd>Firewall & NAT</kbd> to
+<kbd>Conservative</kbd> I had no more of these hangs of my SSH sessions.
+
+I use the `ControlMaster` setting in my SSH configuration so the stalled
+connections have to be killed with something like
+
+```console
+$ ssh -O exit {short hostname}
+```
+
+every time -- which is annoying.