Errors in the Gateway Error Log detected
Checked  Gateway Logs: 
 
Transaction: SMGW ? Goto ? Trace File ? Display. 
and use SM21 for system log entries. 
 
RFC Destinations: are validated 
 
Transaction: SM59 ? Tested affected destinations. 
 
dev_rd is the main trace file for the SAP Gateway. 
checks done on below 
 
RFC connection attempts 
Registration/deregistration of RFC servers 
Errors in communication 
Timeouts 
Gateway crashes/restarts 
Internal Gateway processing steps 
no major issues observed, closing as resolved.