Due to how the Sleepy Hams server is set up, if you attempt to log into Mumble from a different computer than the one you originally logged in with, you will receive a “Wrong password for user error.”
To handle this, you need to export the certificate from the original computer, and then import it to the new computer.
Click Configure -> Certificate Wizard. Select Export current certificate, and then press Next. On the next screen, press Save As, and find a good location on your computer to save the certificate to – the Desktop is a good choice!
At this point, move the certificate file to the new computer through some method – a USB flash drive, email, etc.
Next, you’ll repeat the same steps, but instead of Export current certificate, you’ll select Import a certificate. After this, you should be able to connect to Sleepy Hams!