Login | Register For Free | Help
Search for: (Advanced)

Mailing List Archive: OpenSSH: Bugs

[Bug 2029] New: ssh connection failure error message confusing when talking to dual IPv4/6 host

 

 

OpenSSH bugs RSS feed   Index | Next | Previous | View Threaded


bugzilla-daemon at mindrot

Jul 30, 2012, 8:58 AM

Post #1 of 1 (151 views)
Permalink
[Bug 2029] New: ssh connection failure error message confusing when talking to dual IPv4/6 host

https://bugzilla.mindrot.org/show_bug.cgi?id=2029

Priority: P5
Bug ID: 2029
Assignee: unassigned-bugs [at] mindrot
Summary: ssh connection failure error message confusing when
talking to dual IPv4/6 host
Severity: normal
Classification: Unclassified
OS: Linux
Reporter: sklist [at] kitterman
Hardware: ix86
Status: NEW
Version: 5.9p1
Component: ssh
Product: Portable OpenSSH

I have a dual IPv4/6 server which has both A and AAAA records
published for it's primary domain name. I had just rebooted the
server for a kernel update and was trying to ssh back in. It failed
with a "network unreachable" error which was totally misleading. The
issue was that the server was slow to come up and was not listening
on
port 22 yet. The error message should have been "connection
refused".

During the period when I was waiting, if I used ssh directly to the
IPv4 address, I (correctly) got "connection refused". When I ssh'd
to
the IPv6 address I (also correctly) got network unreachable since
there is no IPv6 connectivity other than link-local on the network
the
ssh client was connecting from.

it looks like what ssh is doing in the case of a host with dual
A/AAAA
records is looking them both up, trying both connections, and if the
case of both failing, it's returning the IPv6 error message. In this
case it was quite confusing as there's no indication it's an IPv6
connection the message is about. I was trying to figure out how I
could ping the server and at the same time have the network be
unreachable.

It would be better if, in the case of two errors, network unreachable
is only handed back to the user if no other error (such as connection
refused) does not indicate that the network was reachable and a
connection to the remote server made at some level.

--
You are receiving this mail because:
You are watching the assignee of the bug.
_______________________________________________
openssh-bugs mailing list
openssh-bugs [at] mindrot
https://lists.mindrot.org/mailman/listinfo/openssh-bugs

OpenSSH bugs RSS feed   Index | Next | Previous | View Threaded
 
 


Interested in having your list archived? Contact Gossamer Threads
 
  Web Applications & Managed Hosting Powered by Gossamer Threads Inc.