Hi Swapna,
Refer This thread.
http://scn.sap.com/thread/3148010
If doesn't help, please check these links.
http://www.pieterhendrikx.com/tag/unable-to-load-url/
http://www.pieterhendrikx.com/tag/unable-to-load-url/http://www.forumtopics.com/busobj/viewtopic.php?p=857384
http://www.forumtopics.com/busobj/viewtopic.php?p=857384http://www.forumtopics.org/busobj/viewtopic.php?t=120439&sid=3bef60502b83e11b77b7afab91472d5e
Thanks,
Sara