Minecraft server fails to start up after crash

[Pdani001]

So my server crashed at 11:25 (UTC+2), and now it fails to start up, even when reinstalled.

[Pdani001]

I managed to fix it with a pufferd restart, but now i encountered a new problem:
When i try to start the server it says that the port is already in use, and if i check minecraft it says Pinging... and then changes to Can't connect to server.

[Phlupp]

click the "Kill" button, then try to restart the server. Maybe pufferd din't kill the server well. Have a look
to console, enter the command:

ps -ax | grep java