add ssh error message

[notapoptab]

Members of organizations may not be aware if the appropriate ports have been opened by their IT departments for ssh to work. While ssh is a more secure protocol, some places are reticent to open ports for it to work.

It may be worth adding a quick screenshot or flag as to what the error message looks like if ssh will not work in an organization. With that, it should be mentioned that participants will need to use https.

I am happy to do the pull request with the error if this would be helpful to others, just let me know :)

[kekoziar]

related to #864