openssh bugs - Nov 2018 - [Bug 2930] New: 7.9p1 cannot establish connections

https://bugzilla.mindrot.org/show_bug.cgi?id=2930

            Bug ID: 2930
           Summary: 7.9p1 cannot establish connections
           Product: Portable OpenSSH
           Version: 7.7p1
          Hardware: ix86
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: kq1quick at gmail.com

$ ssh -T git at 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 at 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
$

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Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at dtucker.net

--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
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

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Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|7.7p1                       |7.9p1

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Kevin Quick <kq1quick at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #2 from Kevin Quick <kq1quick at gmail.com> ---
That fixed it!  Thanks for the update, and I apologize for not finding
that myself.

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--- Comment #3 from Darren Tucker <dtucker at dtucker.net> ---
Was the root cause VMWare Fusion or something else with the same
symptoms?

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--- Comment #4 from Kevin Quick <kq1quick at gmail.com> ---
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.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #5 from Damien Miller <djm at mindrot.org> ---
close bugs that were resolved in OpenSSH 8.5 release cycle

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