Bug 2930

Summary: 7.9p1 cannot establish connections
Product: Portable OpenSSH Reporter: Kevin Quick <kq1quick>
Component: sshAssignee: Assigned to nobody <unassigned-bugs>
Status: CLOSED INVALID    
Severity: critical CC: dtucker
Priority: P5    
Version: 7.9p1   
Hardware: ix86   
OS: Linux   

Description Kevin Quick 2018-11-14 09:37:17 AEDT 
$ ssh -T git@github.com -v
OpenSSH_7.9p1, OpenSSL 1.0.2p  14 Aug 2018
...
debug1: Offering public key: /home/kquick/.ssh/id_rsa RSA SHA256:<elided> agent                                
debug1: Server accepts key: /home/kquick/.ssh/id_rsa RSA SHA256:<elided> agent                                 
debug1: Authentication succeeded (publickey).
Authenticated to github.com ([192.30.253.113]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: network
packet_write_wait: Connection to 192.30.253.113 port 22: Broken pipe
$

The same operation works under 7.7p1:

$ ssh -T git@github.com -v
OpenSSH_7.7p1, OpenSSL 1.0.2p  14 Aug 2018
debug1: Offering public key: RSA SHA256:<elided> /home/kquick/.ssh/id_rsa                                      
debug1: Server accepts key: pkalg ssh-rsa blen 149
debug1: Authentication succeeded (publickey).
Authenticated to github.com ([192.30.253.112]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
Hi kquick! You've successfully authenticated, but GitHub does not provide shell access.                                                           
debug1: channel 0: free: client-session, nchannels 1
Transferred: sent 2216, received 1640 bytes, in 0.2 seconds
Bytes per second: sent 10557.1, received 7813.0
debug1: Exit status 1
$
Comment 1 Darren Tucker 2018-11-14 11:07:29 AEDT 
This looks similar to the problems reported due to VMWare Fusion's NAT not being able to handle the new default values for IPQoS.  Try

ssh -o "IPQoS lowdelay throughput" [otherstuff]

See https://lists.mindrot.org/pipermail/openssh-unix-dev/2018-August/037145.html
Comment 2 Kevin Quick 2018-11-15 06:47:50 AEDT 
That fixed it!  Thanks for the update, and I apologize for not finding that myself.
Comment 3 Darren Tucker 2018-11-15 10:34:57 AEDT 
Was the root cause VMWare Fusion or something else with the same symptoms?
Comment 4 Kevin Quick 2018-11-20 06:19:40 AEDT 
Yes, I'm using VMWare Fusion 8.5.8 on a Mac to run Linux in the VM.

BTW, you changed the report version from 7.7p1 to 7.9p1 (thanks) and I entered this as 7.7p1 because 7.9p1 wasn't available from the Bugzilla dropdown list.
Comment 5 Damien Miller 2021-03-04 09:52:47 AEDT 
close bugs that were resolved in OpenSSH 8.5 release cycle