When I turn off the firewall, I can access my XAMPP website through other LAN computers. When I turn on firewall then I cannot connect to the machine anymore. Could someone tell me what's happening?
my os is windows xp. thanks.
Go to Control panel - > go to Windows Firewall -> then Advance Settings ->
Try This, I hope it will Work for you.
Well , first of all, firewall on host is blocking your connection. If you are using Windows firewall or any other firewall You need to make an excaption rule for XAMPP.
So, on computer where is web site hosted go to Control panel-> Windows Firewall and uncheck Don't allow exceptions checkbox. Now open Exceptions tab and click on a button Add program and locate Xampp and Apache. Add them to firewall exception rule.
Maybe you should do this test on some Virtual Machine (VMware, Virtualbox..etc) becouse opening ports and adding exceptions if this machine is connected to Internet is not secure.
I understand this is an old question and related to Windows XP but now for users using current OS like Windows 10 the option that worked for me is that Inbound Rules Profile could be set to Public for Apache Http Server which is set to Private by default.

The profile could be set in 'Advanced' tab of Apache Http Server Inbound Rules properties as shown below (Properties Dialog box could be opened by Right Clicking on Apache Http Server and select Properties):

In my case, (windows 10 and xampp v3.3.2) 1. Open Control Panel 2. Search for windows fire wall 3. Click Advance setting 4. Click inbound rules 5. Allow all blocked rule in name Apache HTTP Server and mysqld

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