Add more troubleshooting docs

Author: ddworken

docs/troubleshooting.md

@@ -40,8 +40,19 @@ user than you are using for kssh.
 
 ## SSH rejects the connection
 
-This likely means that you have not configured the SSH server correctly. Review the directions in README.md and ensure
-that you have followed the steps correctly ([sshca.md](./sshca.md) also has some additional information on how SSH CAs work that may
+This likely means that you have not configured the SSH server correctly. Confirm that on the SSH server you are trying to access:
+
+* `/etc/ssh/ca.pub` has an SSH public key in it
+* `/etc/ssh/auth_principals/username-of-ssh-user` has the name of your Keybase team in it (or multiple comma separated keybase teams)
+* `/etc/ssh/sshd_config` has the below two lines somewhere in it:
+
+```
+TrustedUserCAKeys /etc/ssh/ca.pub
+AuthorizedPrincipalsFile /etc/ssh/auth_principals/%u
+```
+
+If that all looks good, review the getting started directions and ensure that you have followed the steps correctly 
+([sshca.md](./sshca.md) also has some additional information on how SSH CAs work that may
 be helpful). If you would like to follow an example, see the code in the `tests/` directory which contains integration 
 tests (focus on Dockerfile-sshd for an example SSH server setup). If none of that works, the best strategy is to run
 SSH on the server on an alternate port and review the debug information. On the server run `/usr/sbin/sshd -dd -D -p 2222`
@@ -110,3 +121,8 @@ It may be useful to define aliases in your bashrc to simplify this:
 alias kscp='kssh --provision && scp -F ~/.ssh/kssh-config'
 alias krsync='kssh --provision && rsync -e "ssh -F $HOME/.ssh/kssh-config"'
 ```
+
+## Other
+
+For any other issues, please open a Github issue or ping @dworken on Keybase! We want to make this project as reliable
+as possible so please let us know if there are any ways we can improve the project.