Thanks for your help, River. However, now it says "Server unexpectedly
closed network connection." (after doing nothing for ~ 10 Seconds). What
could the reason be for this?
And the case-sensitive username: Did it work before with 'Yellowcard'? I
have never changed my PuTTy configuration (because I have no idea what I
am doing there) and it worked fine before.
Yellowcard.