External RFC connections hanged in SMGW

HI,

Could somebody help me out how we can manually delete the RFC connections in SMGW?

The follwoing is not working, i have tried already:

1) Forcily pool back the connections using JCO

2) In SMGW Goto->ActiveConnection->Delete Connection

If i perform option 2), i m getting SAP error code 474. The connections got hanged like this and finally i need to restart the SAP instance.

Is there any way i can restart SMGW so that all connections are cleared?

Regards,

Ravi.