1) I'm running the evaluation version of PHPEdit.
2) I've successfully install the server side debugger because I can see this message: "This program makes use of the Zend Scripting Language Engine:
Zend Engine v1.3.0, Copyright (c) 1998-2004 Zend Technologies with DBG v2.11.32, (C) 2000,2005, by Dmitri Dmitrienko".
3) I've successfully installed PHPEdit v.1.2.5.17 on my XP workstation. I have no problems debugging PHP codes if both the client and server reside on my XP machine.
4) Linux servier IP: 10.2.21.8. Windows XP workstation is 10.2.21.9.

5) Now I am trying to debug PHP code which is located in the Linux server. I don't know how it actually works.
This is what I have done so far:
5) On the Linux server, Samba is running. On the XP machine, I've successfully map O: drive to /var/www/html.
6) I've followed your instruction (http://forum.nusphere.com/tip-troubleshooting-debugger-communications-t579.html ) like this:
###
[root@tmdlx8 samba]# telnet 10.2.21.9 7869
Trying 10.2.21.9...
Connected to 10.2.21.9.
Escape character is '^]'.
###

But I couldn't "see black dot inside the white circle in DbgListener icon".

7) In /usr/local/lib/php.ini, I've added the following lines:
###
extension=dbg.so-4.3.7
[debugger]
debugger.enabled=on
debugger.profiler_enabled=on
debugger.hosts_allow=10.2.21.9 10.2.21.18
debugger.hosts_deny=ALL
debugger.ports=7869, 10000/16
###

From here, I do not know what to do. Pls help. Thanks.

Now I can see the message in the Log Window box:
12/20/2005 6:06:19 PM 10.2.21.8 client connected

1) In the PHPEdit IDE, I open up file O:\index.php. When I run the debugger, I get this message:
###
HTTP host not found. Please, check URL: O%3A/index.php
###

How do I resolve this problem? Thanks.

What you're trying/evaluating is not NuSphere's product.
NuSphere corp. provides support for NUSPHERE products only, in particular NuSphere PHPED IDE available from this link: http://shop.nusphere.com/customer/download/files/NuSphere-phped-4.0evl-Win32.exe.

Thanks for providing the url.