Can't execute External command whois

Hi all, I had a PHP script (copy from somewhere) that running was running "very well for several months" in 3store.com, but it can't run correctly suddenly! So that I sent an email to my "Web hosting" company to ask for help, but they always said that it was PHP script error that they will not support it even though I had copy the same script to other domain mask2000.com to prove that the script is run very well. In 3store http://3store.com/php/whois3.html always return "Already registered" because it can't run the "whois" command But in Mask2000 http://mask2000.com/php/whois3.html everything is OK Will it be a PHP config problem, or user right ...etc. The "whois" command is work if I telnet to the server. Any suggestion? Ahchi ********************************* * Email: ahchi@3store.com * Business web site: http://3store.com * Personal web site: http://i.am/ahching *********************************