Possibility to debug SSH communication done by ffi?

[JanBliznicenko]

Is there a way to get some kinds of logs of communication with git server when using SSH keys in Iceberg? My problem is that one private gitlab server does not seem accept my SSH keys when using Pharo.

• The server accepts the very same keys when used by any other tool, like git in linux, Git for Windows, IntelliJ git plugin etc.
• The very same keys work in Pharo with any other git server (incl. gitlab.com and other private gitlab instances)
• The behavior is the same with any version of Pharo (tried 7, 10, 11) and any OS (tried Win and Linux)
• The keys are RSA ones, but other types of keys do not work either

So only Pharo + this one gitlab instance does not work, any other combinations do -> wierd. That's why I need to debug the problem to find out if this is problem in Pharo, libgit2 or the gitlab server.

All I was able to find is that Pharo gets EUSER error.