Yes. By default SUSEfirewall is running, and blocks port 22 for incoming connections (of course you can still use ssh or telnet to connect to other machines or to localhost).
You can configure the firewall in YaST->Security and Users->Firewall.
Either turn it off (in Startup), or add the interface you want to connect to to the internal zone (in Interfaces), or open the ports in “Allowed Services”. Choose “Secure Shell Server” from the chooser and click on “Add”.
Or maybe easier:
Enter YaST->Network Services->SSHD Configuration, you can configure sshd there.
This contains a checkbox labelled “Open Port in Firewall”, enable this and you should be able to connect.