Fix SSH Connection Hanging on Fedora
I connect to a Fedora box for some development work over SSH. This works great, but fairly frequently the connection will hang for a couple of seconds. The keypresses aren't lost, but the display is frozen during this period - making interactive work difficult.
Turns out the issue has to do with the wifi power save mode - if power save is on the wifi radio will sleep between beacons, resulting in the hanging behavior. I'm not sure how specific this is to my setup, but turning off power save mode addressed the issue on my Fedora install with an intel wifi card. YMMV.
For a test, you can run the following. This will persist until a reboot.
sudo iw dev <interface> set power_save off
# verify this ouptut of this command is: Power save: off
iw dev <interface> get power_save
If that resolves it, you can make it a permanent change by adding the following to NetworkManager config (at least on systemd systems). Reboot or restart the network manager (sudo systemctl restart NetworkManager) for the change to take effect
# /etc/NetworkManager/conf.d/wifi-powersave.conf
[connection]
wifi.powersave = 2