getting programs to execute

Howdy Y'all: I'm about to go live with the Signio/VeriSign Payflow Pro program and have run into a critical problem I hope y'all can assist with, please. I've set up my own shopping cart program. It works fine from home. The system here is as follows: NT 4.0 (SP 6a), Apache 1.3.6, PHP 4.0.2. But, on line at my ISP, there's a hitch. This is their setup: NetBSD 1.4.2, Apache 1.3.12, PHP 4.0.2 (as CGI). Using the linux 5 (a.out) version of Payflow Pro The hitch is the seeming inability to have my PHP scripts execute the Payflow Pro program while being viewed as a web page, despite the same script being able to correctly run the Payflow Pro program from a command line. So, I created a test script to hack away at this problem. I set it up to run a variety of programs. All of these execute and display their outputs just fine from a web browser [and a command line]: # $Program = "blah.cgi"; # $Program = "zzzz ch checking.htm"; # zzzz is a copy of "zip" # $Program = "test.sh"; The only program that doesn't work when the script is called from the web browser is pfpro: $Parameters = "... [actual parameters go here] ..."; $Program = "pfpro test.signio.com 443 \"$Parameters\""; NB: The directory and program variables are then combined into a command variable, which is then run: $Directory = "./test"; $Command = "$Directory/$Program"; $Result = system("$Command"); I've also tried PHP's exec() and passthru() funcions as alternatives to system(). Leaving it on system() right now so I can see the actual screen output of the program. By the way, the test script, test.cgi, is chmoded 705 while all programs called by it are chmoded 700. They're owned by me and in the correct group, as they should be. Again, from the command line, the program runs fine, connecting with the Payflow Pro program and getting appropriate responses without a problem. I'm at a loss. Any and all help will be greatly appreciated. Thanks, --Dan -- T H E A N A L Y S I S A N D S O L U T I O N S C O M P A N Y More than just answers. Solutions. (SM) http://www.analysisandsolutions.com/ 4015 7 Av #4, Brooklyn NY 11232 v: 718-854-0335 f: 718-854-0409