Yes. Stellarmate does not use the default SSH port. Use port 5624 to login to StellarMate using your username and password.

ssh -p 5624 This email address is being protected from spambots. You need JavaScript enabled to view it.

The same port should be used for SFTP (e.g. in FileZilla). You can perform remote update using the following command:

sudo apt-get update && sudo apt-get -y dist-upgrade