SAP Data Services Designer - error in salesforce adaptar datasotore

I have created a datastore using the salesforce adapter instance created in my jobserver but connection to Salesforce fails with the following message in the adapter instance.

Fault-tolerance-login-failed : There was a communication error when talking to Salesforce.com: Connection reset.

in the datastore definition I have used my salesforce account and password and also tried with the password plus the security token (all together) but still fails. My installed version is 14.2.11

I would appreciate your suggestions to solve this issue.

Thanks