Comment 3 for bug 1872075

SUMMARY

The Android app offers ssh key exchange using diffie-hellman-group14-sha1 and diffie-hellman-group1-sha1. In the newest version of openssh the former was removed from the defaults, the latter has been disabled for a while. This results in kdeconnect not being able to create a connection using sshfs.

STEPS TO REPRODUCE
1. Click on your phone icon in dolphin

OBSERVED RESULT
Error message

EXPECTED RESULT
A connection to the phones file system

SOFTWARE/OS VERSIONS
App on Android version 1.13.7
kdeconnect 1.4.1 on Linux

ADDITIONAL INFORMATION

kdeconnectd[1119]: kdeconnect.plugin.sftp: Mount device: "XXX"
kdeconnectd[1119]: kdeconnect.plugin.sftp: Created mounter
kdeconnectd[1119]: kdeconnect.plugin.sftp: Starting loop to wait for mount
kdeconnectd[1119]: kdeconnect.plugin.sftp: Mount device: "XXX"
kdeconnectd[1119]: kdeconnect.plugin.sftp: Unmount QObject(0x0)
kdeconnectd[1119]: kdeconnect.core: Converting IPv6 QHostAddress("::ffff:192.168.178.29") to IPv4 QHostAddress("192.168.178.29")
kdeconnectd[1119]: kdeconnect.plugin.sftp: Starting process: "sshfs kdeconnect@192.168.178.29:/ /run/user/1000/719fb2d6a31cfd4d -p 1739 -s -f -F /dev/null -o IdentityFile=/home/XXX/.config/kdeconnect/privateKey.pem -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o HostKeyAlgorithms=+ssh-dss -o uid=1000 -o gid=1000 -o reconnect -o ServerAliveInterval=30 -o password_stdin"
kdeconnectd[1119]: QDBusAbstractAdaptor: Cannot relay signal SftpPlugin::packetReceived(NetworkPacket): Unregistered input type in parameter list: NetworkPacket
kdeconnectd[1119]: kdeconnect.plugin.sftp: Process started
kdeconnectd[1119]: kdeconnect.plugin.sftp: "XXX" "Remote filesystem mounted at /run/user/1000/719fb2d6a31cfd4d"
kernel: fuse: init (API version 7.31)
kernel: *** VALIDATE fuse ***
kernel: *** VALIDATE fuse ***
systemd[1]: Mounting FUSE Control File System...
systemd[1]: Mounted FUSE Control File System.
kdeconnectd[1119]: kdeconnect.plugin.sftp: stdout: "Unable to negotiate with 192.168.178.29 port 1739: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group1-sha1\r\n"
kdeconnectd[1119]: kdeconnect.plugin.sftp: stdout: "read: Connection reset by peer\n"
kdeconnectd[1119]: kdeconnect.plugin.sftp: Process failed (exit code: 1 )
kdeconnectd[1119]: kdeconnect.plugin.sftp: Unmount KProcess(0x55837cbda9d0)
systemd[975]: run-user-1000-719fb2d6a31cfd4d.mount: Succeeded.
systemd[1]: run-user-1000-719fb2d6a31cfd4d.mount: Succeeded.
kdeconnectd[1119]: kdeconnect.plugin.sftp: Destroy mounter
kdeconnectd[1119]: kdeconnect.plugin.sftp: Unmount QObject(0x0)