Troubleshooting

Here are some suggestions for troubleshooting KeeAgent.

Common issues

Problem:

After upgrading my OS, my 1024-bit RSA key no longer works with KeeAgent in Client mode.

Solution:

OpenSSH dropped support for RSA keys <= 1024-bit in v7.6 because they are no longer considered secure. This version of OpenSSH ships with Ubuntu 18.04 and macOS High Sierra. Create a new, larger key.

Problem:

Connecting to a server fails when too many keys are loaded in KeeAgent. For example, you might get an error message like this:

Server sent disconnect message type 2 (protocol error): "Too many authentication failures for user"

Many servers will only try the first 6 keys before returning an error. This number will vary from server to server though.

Solution:

To work around this, limit the number of keys that load automatically, use the Show selection dialog when a client program requests a list of keys option or consider having the keys saved to a temporary file as described in Tips and Tricks.

Problem:

When I start KeePass, I get an error message like this:

The following plugin is incompatible with the current KeePass version:
Have a look at the plugin's website for an appropriate version.

Solution:

Run KeePass.exe from a command prompt with the --debug option (and --saveplgxcr for KeePass versions older than 2.31). This should give more detailed information on the cause of the error. Report the error using the link for other issues below.

Problem:

Keys will not load with the confirm constraint.

Solution:

On Windows, if you are using Pageant and running KeeAgent in client mode, then constraints will not work. Pageant does not support constraints.

On Linux, if you are using a GNOME based desktop (includes Cinnamon, MATE, Unity, others), follow the instructions for disabling the SSH agent in GNOME keyring.

Problem:

“The plugin cannot be loaded A newer .NET framework is required.” error on Linux and KeePass version is less than 2.52.

Solution:

Use workaround described in issue #343.

Other issues

Read everything here and still having problems?

Report your issues on GitHub.

Debugging

You can use Visual Studio to see a limited amount of debug information.

Prerequisite: Visual Studio 2022 with the .NET desktop development workload installed.

1. Start KeePass.

2. Start Visual Studio.

3. Select Continue without code.

   

4. Click the Attach button.

   

5. Select KeePass from the list of processes. Use the filter to find it quickly.

   

6. Click the Attach button.

7. Select the Output tab.

   

8. Reproduce the issue in KeePass/KeeAgent.

9. Look for any useful information in the Output tab.