Kate's Comment

Thoughts on British ICT, energy & environment, cloud computing and security from Memset's MD

SSH hanging with X11 untrusted timeout on MacOS

Lately my personal Macbook Pro has started refusing to log in to my servers via SSH. I tried all sorts of things, removing my key, clearing hosts files, but to no avail. ssh -vvv showed this (some bits removed of course):

debug1: Authentication succeeded (publickey).
Authenticated to kateX.miniserver.com ([X.X.X.X]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug2: callback start
debug2: Checking for xauth using /opt/X11/bin/xauth -f /var/folders/61/97l_X/T//xauth_test exit > /dev/null 2> /dev/null

debug2: x11_get_proto: /opt/X11/bin/xauth -f /var/folders/61/X/T//ssh-X/xauthfile generate
/private/tmp/com.apple.launchd.X/org.macosforge.xquartz:0 MIT-MAGIC-COOKIE-1 untrusted timeout 1260 2>/dev/null

It looked like a problem with X11 forwarding, but I wasn’t trying to forward my X11 connection which threw me at first, but sure enough by disabling X11 forwarding with -x I am now able to log into my servers, like so:

ssh -x root@kateX.miniserver.com

I tried editing /etc/config/ssh_config and uncommenting “ForwardX11 no” but that didn’t help either; I still had to use the -x option. Likewise, clearing ~/.Xauthority had no effect.

If anyone has a suggestion as to how to force SSH to not attempt a X11 connection by default, please leave a comment!

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