Addressing #563 (Cannot parse privateKey: Unsupported key format)

docs/_docs/troubleshooting/ssh-troubleshooting.md

@@ -20,7 +20,25 @@ Several things can cause this:
 1. `ssh_private_key.pem` was installed to the wrong location. Make sure that it is in the `config/security` directory and has the name matching the error message. You can also change your `config.hjson` if you prefer to point to the location of the key file.
 2. `ssh_private_key.pem` has the wrong file permissions. Verify that the file will be readable by the user that the BBS is running as. Because it is a cryptographic key however, we do recommend that access is restricted only to that user.
 
-## Error With Netrunner
+## Cannot parse privateKey: Unsupported key format
+
+***Symptom:***
+BBS not starting with an error similar to the following:
+
+```shell
+Error initializing: Error: Cannot parse privateKey: Unsupported key format
+```
+
+***Solution:***
+Depending on the OpenSSL version, a specific key format is used to generate the private key. The error above is observed on Debian 12 (Bookworm), but might present itself on other Debian 12 derivatives.
+
+Convert the unsupported key to a supported one:
+
+```shell
+openssl rsa -in unsupported.key -out converted.key -traditional
+```
+
+## Errors With Netrunner
 
 ***Symptom:***
 Some ssh clients connect, but Netrunner (and other older clients) get a connection failed message and the following is in the log:

misc/config_template.in.hjson

@@ -157,7 +157,15 @@
             //
             //  3 - Finally, set 'enabled' to 'true'
             //
+            //  ! - If you receive the following error when starting ENiGMA:
+            //  "Error initializing: Error: Cannot parse privateKey: Unsupported key format"
+            //  You might need to convert your key. This can be done as follows:
+            //
+            //  > openssl rsa -in unsupported.key -out converted.key -traditional 
+            //
+            //
             //  Additional reading:
+            //  - https://nuskooler.github.io/enigma-bbs/troubleshooting/ssh-troubleshooting.html
             //  - https://blog.sleeplessbeastie.eu/2017/12/28/how-to-generate-private-key/
             //  - https://gist.github.com/briansmith/2ee42439923d8e65a266994d0f70180b
             //