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Liam Kelly
Asked: 2018-04-27 05:44:29 +0800 CST

OpenSSH client works, but Putty can only receive data

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There is an application with a custom SSH interface that authenticates then launches a command line utility. It works as expected using OpenSSH's Client:

Login Prompt -> 
Username/pass <- 
Main Menu ->
Menu Select <-
Other Menu Opts ->
-> = To Client
<- = To SSH Server

However with Putty, no data is sent after the Username and Password

Login Prompt -> 
Username/pass <- 
Main Menu ->
Menu Select -X (no data sent)
-> = To Client
<- = To SSH Server

What setting in Putty could lead to this behavior? Do you believe it is a terminal setting or an SSH setting? Does the server need to respond to a special SSH Req?

ssh

1 Answers

  1. The problem was due to the the SSH Server not responding to OOB SSH Requests. OpenSSH doesn't care about this, Putty will not send data unless it gets response.

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