Host key verification failed in Core Tunnel (Mac)

I am using CoreTunnel for a longer time now and since a few months i have a issue. The issue is that when i make a tunnel and check it manually in the commandline it works. But when i execute the tunnel through CoreTunnel i always get the following error "Host key verification failed".

I tried a lot of things also deleting my known hosts file but this is not resolving the issue. When i use the Equivalent command (in Core Tunnel) it always work.

I am using it on a Macbook version: 3.6.2

Grt. Anass

Please navigate to Preferences… > Advanced > Known Hosts, delete your host item and try again.