Hi Vijay,
Looks like you are facing some connection issues, please review notes below, and restart your BWA, recreate the RFC connections, verify the hardware and network.
1077788 BWA 7.00 & 7.20: Start-/stop sequence of blades (use these steps to restart the BWA landscape)
1916242 How to simple address RFC issues in Business Warehouse Accelerator
1870916 BWA Troubleshooting: Hardware or Network Issues
Thanks,
Diego Seben