No SSH connection after installing ntp

Hey there,

i connected my bbb to wifi and then i wanted to set up the time automaticly with ntp. i followd these steps by derek molloy:

http://derekmolloy.ie/automatically-setting-the-beaglebone-black-time-using-ntp/

i tried to undo this by
opkg remove ntp

but i still cant connect to the bbb by ssh.

i also tried to remove the dropbear host key file

any idea out there?