I exported from SSH Tunnel and then imported, and tried to connect, and it failed. (permission denied - public key)
I have a public key - not a private key. This is not really my deep capability - why I used your tool - so was expecting seemless migration between your two products.
Ok, so now what do I do?
Firstly, you must import the key, the file you have used in SSH Tunnel:
Then, in tunnel's settings, force the tunnel use the imported key:
I am baffled, it is the same key - works in the SSH Tunne, but not with Core Tunnel. I did everything you said.
Could you please set the Log Level to DEBUG3 and paste the connection log here?
Equivalent Command: ssh -T -N -F “/Users/bwenzlau/Library/Group Containers/E78WKS7W4U.io.coressh.ssh/.ssh/config” -i “/Users/bwenzlau/Library/Group Containers/E78WKS7W4U.io.coressh.ssh/.ssh/privatekey/terradex_aws.pem” -L local:22:52.37.27.6:22 -o ExitOnForwardFailure=yes ubunto@52.37.27.6
20:27:12 Connecting…
20:27:12 Privileged ports can only be forwarded by root.
20:27:12 Abnormal Disconnect
20:27:12 Connection failed, retry after 3s…
Could you please send me a screenshot of the host in SSH Tunnel? It seems your configuration was not migrated correctly.
Please change the host settings in Core Tunnel according to the screenshot:
/Users/yang/Library/Group Containers/E78WKS7W4U.io.coressh.ssh/.ssh/known_hosts
local to localhost in the screenshot:
How do you upgrade - not intuitive (no upgrade button). No website etc.
You can follow this article to upgrade apps in your Mac:
got it! deleted the old record (in the app) and created new.
Good to know that 
A post was split to a new topic: How to add ssh options -T -N into resulting command
