Hi Dinesh,
Check whether you can ping from application server to SAP OSS destination.
In the SM59 ABAP connection see whether this setup is appropraite.
Targer System: OSS
Under MSG Server:
/H/<Your Development User side IP Address>/S/sapdp99/H/<SAP Provided IP Address>/S/sapdp99/H/oss001
Under Lgon &Security:
Client 001
User: OSS_RFC
Password: Provided by SAP.
All the best,
Zaki