natraj,
it is possible to kill in webMethods 8 version, which version are you using?, if ur using wM8 than please set the property in watt.server.threadKill.enabled=true settings-extended, restart the Is, if any of the threads taking time while ur runing ur integration, u can see in server-statistics-system threads, here u can see thread with cancel and kill icons, here u can click the kill icon to kill the thread.
Regards,
anil kumar elelndula
#Integration-Server-and-ESB#webMethods