Hi Reddy,
For your WSDL problem, the issue is SFDC is expecting a synchronous response for the web-service. Change your Sender Interface to Synchronous and in your channel change the QOS to Best Effort.
Also for your connection issues, check whether the respective SFDC certificates are deployed under TrustedCAs keystore view as the communication would be HTTPs.
Also if you are providing https URL for your web-service then you need to setup SSL in PI system and provide your certificates to be deployed in SFDC server.
Regards,
Nitin