1) what user is the CGI running as? As mentioned before by others, and I belive in the doc's fr Net::Ping, the script needs to be suid root.. which might not be the best thing for a CGI.

2) Also mentioned before, there are issues running TCP pings. Google returned a lot of discussions about things not working quite right with TCP and UDP pings.

3) Depending on what you're doing, there could be a issue of the environment not being the same.

4) Again, posting your code is a good idea.

Rich