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Backup stopped working

tbe
in PhotoBackup for iOS
For a few months I have not been able to back up to my NAS over ssh. I get the error:

Failed to establish an SSH session to 'hostname:port': Unable to exchange encryption keys

I suspect this started after upgrading OpenSSH on the server. Does PhotoBackup need an update to support key types considered secure by recent server versions?

Comments

  • rolando
    Had the same issue and it's def because the probably libssh2 in the ios client is using an old key exchange algorithm. Changing the config on my ssh server to allow legacy algorithms got this working again:


    Use the first set of legacy changes suggested there, reload config on your ssh server.
  • iphoneuser1234
    This is not a good solution. The legacy algorithms were disabled for a reason, namely, that they are no longer secure.

    Please do not do this.

  • whorfin
    It isn't necessary to add all the terrible old algorithms...
    PhotoBackup offers:
    diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1

    Picking the least worse option and adding this to my sshd config worked:
    KexAlgorithms +diffie-hellman-group14-sha1


    Acrosync still needs to update their app!
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