Connect to SAP Gateway Failed

Dear Experts,

  This is my first post after upgrading the SCN

I am using SAP NWDS 7.01.10 (SP10) and my SAP logon pad version 720 (7200.3.7.1066)

I am not able to connect model(Adaptive RFC model) from my NWDS. After giving user credentials it showing the pop up connect to SAP Gateway failed.Please find attached screenshot for you reference.

Could you please give me your suggestion how to resolve this?

note: I tried reinstalled my NWDS and connected but no luck. i tried with librfc.dll file in c:\\windowsNT\system32 then also no luck.

Regards,

Manivannan P