If QC is installed in the same system on which QTP is ,then use below URL for QC :
http://localhost:8080/qcbin/start_a.htm
And If it is installed in some other machine the in the place of local host ,use the machine ip as below example:
http://10.98.12.180:8080/qcbin/start_a.htm
http://localhost:8080/qcbin/start_a.htm
And If it is installed in some other machine the in the place of local host ,use the machine ip as below example:
http://10.98.12.180:8080/qcbin/start_a.htm

