How to Fix: I keep on getting a error when I connect to a ssh tunnel on putty

Error Disconnected: Server protocol violation: unexpected SSH2_MSG_UNIMPLEMENTED packet occurs when trying to connect to a SSH tunnel using PuTTY version 0.66. This issue primarily affects users who are attempting to establish secure connections to remote servers through SSH tunnels.

This error can be frustrating as it prevents users from accessing their desired resources, and resolving the issue is crucial for maintaining productivity. In this guide, we will explore the root causes of this error and provide step-by-step instructions on how to resolve the issue using PuTTY.

💡 Why You Are Getting This Error

• The primary reason for this error is due to a compatibility issue between the SSH protocol version used by the remote server and the version supported by PuTTY. Specifically, the remote server is using an older version of the SSH protocol (SSH-2.0-ROSSSH) that is not compatible with the current version of PuTTY (PuTTY_Release_0.66). This incompatibility causes the SSH2_MSG_UNIMPLEMENTED packet to be sent, resulting in the disconnection.
• Another possible reason for this error could be related to the configuration of the SSH tunnel or the remote server's firewall settings. However, given that the version of PuTTY is current and up-to-date, this alternative cause is less likely to be the primary cause of the issue.

✅ Best Solutions to Fix It

✨ Wrapping Up

To resolve the Disconnected: Server protocol violation: unexpected SSH2_MSG_UNIMPLEMENTED packet error when connecting to a SSH tunnel using PuTTY, it is recommended to configure the SSH protocol version to match the version used by the remote server. If this is not possible, upgrading the remote server's SSH protocol version or using an alternative SSH client may be necessary.