Monitor debug logs-> Best way to trouble shoot the issue, if you want to execute any specific webservice and check the request/response..etc use force.com IDE You can use Force.com IDE for executing webservice classes, running test methods...etc, for more information http://salesforce.stackexchange.com/questions/29899/procedure-to-run-apex-program-in-eclipse-ide
Debug Logs can be used for Troubleshooting purposes in Salesforce.
Go to
Setup --> Monitor --> Logs --> Debug Logs
Thanks
Sfdc Beginner
I appreciate with it
it is the right process then you can try this
You can use Force.com IDE for executing webservice classes, running test methods...etc, for more information http://salesforce.stackexchange.com/questions/29899/procedure-to-run-apex-program-in-eclipse-ide