ssh hangs after Entering interactive session

If you do ssh -v -v -v from the Mac, and then do ssh -v -v -v from VirtualBox, is there a point in the debug output where the Mac takes a hard left turn that is radically different from the VirtualBox connection?

On the destination Linux system look for sshd log entries in /var/log/* files, and see if there is anything interesting there.

You can modify the Linux /etc/ssh/sshd_config file and change the

#LogLevel INFO

to

LogLevel DEBUG3

Then send

sudo kill -HUP <sshd's pid>

so it will re-read the sshd_config file. Or reboot the Linux system.

NOTE: change the LogLevel back after you have finished diagnosing the ssh connection.

You should test by renaming your ssh ~/.ssh/config file just to make sure it is not something in the config file interfering from the Mac.

Are you trying to send Linux X11 displays back to the Mac?

I use:

ssh -4 -C -Y remote.linux.address

and my exported Linux displays come back to XQuartz just fine. The -Y is ForwardX11Trusted in a config file. I've used -X (ForwardX11) in the past, but I have less problems using -Y. The -4 to force IPv4 may or may not be affecting your connections, as the Mac may try using IPv6, and that is still not as robust on all platforms and routers.

Up until last Christmas, I used Mavericks with XQuartz over ssh -Y connections. The past year I've been using El Capitan and XQuartz to do the same thing.

The only ssh problem I had with El Capitan was its ssh defaulting to using more secure encryption, but the AIX systems I also work with still using only the older ssh encryption. I had to add older ciphers to the /etc/ssh/sshd_config file on my iMac so that AIX could ssh into my iMac (I frequently use scp and rsync over ssh to transfer files)

# in /etc/ssh/sshd_config I had to add this very long single line

# so older AIX systems could ssh to my iMac:

Ciphers 3des-cbc,blowfish-cbc,cast128-cbc,arcfour,arcfour128,arcfour256,

aes128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,

aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,

aes256-gcm@openssh.com,chacha20-poly1305@openssh.com

as one very long line.

Otherwise ssh has been a very dependable tools that I depend on all day long at work.

From:

https://www.xquartz.org/releases/archive.html

• XQuartz 2.7.5 - 2013-11-10 - First release supported on Mavericks
• XQuartz 2.7.6 - 2014-05-17 (I assume this is also Mavericks)

I do NOT know if newer versions for Yosemite, El Capitan or Sierra will work for Mavericks.

I am running 2.7.11 (current release) on El Capitan and it is working fine. It has been a year since I ran Mavericks, and I do not know what version of XQuartz I was running at the time.