Unable to start migration in Plesk: Failed to connect to the source server ‘source’ (203.0.113.2) by SSH: encountered RSA key, expected OPENSSH key

Dmitry Bystrov

1 year ago

Symptoms

Migration via SSH key fails with one of the following errors in Tools & Settings > Migration and Transfer Manager:

Failed to connect to the source server 'source' (203.0.113.2) by SSH: encountered RSA key, expected OPENSSH key

Failed to check SSH connection to the source server 'source' (203.0.113.2): q must be exactly 160, 224, or 256 bits long

Failed to check SSH connection to the source server 'source' (203.0.113.2): p must be exactly 1024, 2048, or 3072 bits long
Paramiko version 2.9 or above is installed on the target server:

Debian-based OS (Debian, Ubuntu, etc.):

# dpkg --list | grep paramiko
ii plesk-py27-paramiko 2.10.3-ubuntu.20.04.220330.1131 amd64 SSH2 protocol library

RPM-based OS (CentOS, RHEL, CloudLinux, AlmaLinux, etc.):

# rpm -qa | grep paramiko
plesk-py27-paramiko-2.10.3-1centos.7.220330.1131.x86_64
OpenSSH version 5.9 or lower is installed on the source server:

# ssh -V
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013

Cause

Product issue:

#PMT-5041

Workaround

Regardless of which Linux distributive is in use, before applying the personalized steps below, add the SSH-RSA support to the SSH client's config file at /etc/ssh/ssh_config

Connect to the target server via SSH;
open the file

# vi /etc/ssh/ssh_config
Add the following line

# PubkeyAcceptedKeyTypes +ssh-rsa

For Debian-based distributions (Debian, Ubuntu, etc)

On Plesk's PMM repository, find the folder for your Linux Distribution and get the URL for Paramiko 2.7.
Replace the URL from the command below and fetch the Paramiko package:

# wget http://autoinstall.plesk.com/PMM_0.1.11/dist-deb-Debian-10.0-x86_64/packages/plesk-py27-paramiko_2.7.1-debian.10.200520.1813_amd64.deb
Downgrade Paramiko with the following commands:

# dpkg -r --force-depends plesk-py27-paramiko
# dpkg -i plesk-py27-paramiko_2.7.1-debian.10.200520.1813_amd64.deb

For RPM-based distributions (CentOS, RHEL, Cloudlinux, etc.)

Connect to the target server via SSH;
On Plesk's PMM repository, find the folder for your Linux Distribution and get the URL for Paramiko 2.7.
Remove the current paramiko package from the server:

# rpm -e plesk-py27-paramiko --nodeps
Replace the URL from the command below with the one from step 2 and install the Paramiko package:

# rpm -i --nodeps http://autoinstall.plesk.com/PMM_0.1.11/dist-rpm-CentOS-7-x86_64/packages/plesk-py27-paramiko-2.7.1-1centos.7.200210.1834.x86_64.rpm

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