Resolved Plesk Migration failed encountered RSA key, expected OPENSSH key

[lucflash]

Hey guys,

i would like to migrate from a Debian 8 Server with Plesk to a new one with CentOS 7.
i managed the exact task multiple times last year and always used the method using ssh key file.
The error message says:

Failed to connect to the source server 'source' (XXX.XXX.XXX.XXX) by SSH: encountered RSA key, expected OPENSSH key

in /var/log/auth.log on the source server i can see:

userauth_pubkey: unsupported public key algorithm: rsa-sha2-512

i know debian 8 is out of date, but is there any chance of make a compatible call?
i tried generating new keyfile on the source server and the destination server


anyway i also tried using the name + password method with no success:

Failed to fetch basic information about resellers, clients and domains data from source servers
Cause: Command execution failed on the local server with non-zero exit code.
command: rsync -r --chmod=Fu=r,Du=rwx,go= --timeout=30 -e 'ssh -i /usr/local/psa/var/modules/panel-migrator/sessions/20220114163634/ssh-keys/id_rsa.XXX.XXX.XXX.XXX -p 22 -o PasswordAuthentication=no -o StrictHostKeyChecking=no -o GSSAPIAuthentication=no' /usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_17_0_pmm_shared/ [email protected]:/root/plesk_migrator/plesk_migrator-r9gop9voxf8bkj3jjc3my4ao24gq6dle/pmm_agent
exit code: 255
stdout:
stderr: Permission denied (publickey,password).
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]

That is a critical error, migration was stopped.

i can´t find any solution on the internet.
port.plesk.com/hc/en-us/articles/115000628774-Unable-to-start-Plesk-migration-due-to-invalid-permissions-on-ssh-files-Permission-denied-publickey-gssapi-with-mic- didnt work either

can someone help please?
thanks

 

[lucflash]

I figured it out. Just for someone who is dealing with the same problem.

I checked which algorithms the source server supports with: ssh -Q kex
which was:

diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
diffie-hellman-group1-sha1
[email protected]

then i generated new key files with ssh-keygen -t ecdsa -b 521 because ecdsa is supported.
now migration works

 

[Xaser83]

I had the same problem with CentOS7 and Ubuntu 12.
This indeed was the solution.

Only weird thing is, I never had this problem the last few months with the same version difference.
So what changed?