[Bug 2770] New: open failed: administratively prohibited: open failed

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2770

            Bug ID: 2770
           Summary: open failed: administratively prohibited: open failed
           Product: Portable OpenSSH
           Version: 7.2p2
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jg at jguk.org

Could the error message be improved to clarify what the issue was?
Don't know if it relates to DNS, sockets, ports or a specific file.

Seems to occur sometimes. 
https://unix.stackexchange.com/questions/14160/ssh-tunneling-error-channel-1-open-failed-administratively-prohibited-open

My internet is stable, all my online browsing working well.
This SSH connection also working well from the shell. Both computers on
stable Ethernet connections.

j at ubuntu1404:~/aws$ ssh -i "j.pem" -C -D localhost:8080 ubuntu at x.x.x.x
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-1030-aws x86_64)
ubuntu at ip-x-x-x-x:~$ channel 12: open failed: administratively
prohibited: open failed
channel 16: open failed: administratively prohibited: open failed
channel 20: open failed: administratively prohibited: open failed
channel 5: open failed: administratively prohibited: open failed
channel 6: open failed: administratively prohibited: open failed
channel 7: open failed: administratively prohibited: open failed
channel 3: open failed: administratively prohibited: open failed
channel 4: open failed: administratively prohibited: open failed
channel 6: open failed: administratively prohibited: open failed


This is in a 10 minute period.

Assuming these messages are from "ssh" client?

SSH ob client and SSHD on server is
OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL 1.0.2g  1 Mar 2016

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