https://bugzilla.mindrot.org/show_bug.cgi?id=3582
Bug ID: 3582
Summary: Confusing error message when using ProxyJump
Product: Portable OpenSSH
Version: 9.3p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: ssh
Assignee: unassigned-b...@mindrot.org
Reporter: bluebird090...@proton.me
When connecting to a host through a ssh jumpserver using the ProxyJump
option, error messages returned from the jumpserver are incomplete and
confusing
Example 1: (Connecting to an invalid host name)
When connecting directly, the error message is clear:
ssh: Could not resolve hostname invalid.tdl: Name or service not known
But when using a jumpserver:
channel 0: open failed: connect failed: Name or service not known
stdio forwarding failed
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535
Example 2: (sshd not running)
Error message without Proxy:
ssh: connect to host example.tdl port 22: Connection refused
Error message with Proxy:
ssh example.tdl
channel 0: open failed: connect failed: Connection refused
stdio forwarding failed
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535
Note that the error message is omitting the host and port that refused
the connection.
Ideally, ssh would return the original error message to allow easier
debugging.
The message could show clearly its coming from the jumpserver like
this:
ssh: [jumpserver.tdl REPORTS:] Could not resolve hostname invalid.tdl:
Name or service not known
The additional information like:
stdio forwarding failed
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535
should only be shown when using -v since it is usually not helpful to
locate the root of the issue.
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