I'm trying to add a ssh remote in the web app, but I receive the following error:

Internal Server Error

ssh-keygen ["-F","router.eisenacher81.org"] exited 1

The console complains about the known_hosts file:

/home/michael/.ssh/known_hosts is not a valid known_hosts file. line 44 missing key: AAAAB3NzaC1yc2EAAAABIwAAAIEAtnX75Qa8YVR... key_read: uudecode AAAAB3NzaC1|1|veTakKhYY3OSqCepiq7WAUK8cxQ=|suoi0YU/lgg781Vz9O7yTao5exY= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA4bTnEFFiKz4+i3S9DWHJVoV8CD1DsVRJRodWdTA86+x58S0l0rUyJgXbGwScMI+xFCrqzpd4Hgoc4ElRykj5SL+7IuB5ZAe+4ILQPeiL9ck/1Q7uoh7vWiURXr92Hz5tjuEe3QI9H iKauXj5yj5mGq1VVXLN1CdfQ99G4zSxK7c= failed line 73 invalid key: |1|k9vzo7Ftuxf235It5LbrX36p2f0=|rNHdygip... line 93: invalid hashed name: |1||1|aptgcuUg4ITWhZQLxzRHH8gUIOQ=|Qe2JAlAw++SZosE9ZhQW+fA3twE=...
line 120 missing key: AAAAB3NzaC1yc2EAAAABIwAAAQEAsHa75NfjyB1... /home/michael/.ssh/known_hosts is not a valid known_hosts file.