Hi Sandeep,
This should not be an authorization problem in that case. You may have done this already, but in case you did not: Check if the target system and your PC are able to reach the hostname and port (ie there is no hostname lookup issue or there is no firewall).
If the URL points to Web Dispatcher, check if this URL access is permitted (you should be getting a 403 error, but it is worth the check).
If your source system has XI PCK installed (and you don't use it), undeploy it.
Hope both the source and target system components (especially XITOOLS) are patched.
regards
AKD