Update:
- Reinstalled Windows 7
- Installed Windows 8
- Various Apache tweaks (AcceptFilter http none...)
- Installed Windows XP
Some Wireshark log
1 0.000000000 HonHaiPr_0b:36:ae D-LinkIn_64:ca:28 ARP 42 Who has 192.168.0.1? Tell 192.168.0.102
2 0.001844000 D-LinkIn_64:ca:28 HonHaiPr_0b:36:ae ARP 42 192.168.0.1 is at 28:10:7b:64:ca:28
Works with XP, too bad PHP is dropping support.
Question: Should I throw router out of the window? I can't blame Windows (deep in my heart I want to)
I am experiencing (almost) random connection timeouts, with Apache on Windows7, to the extent that I'm afraid to hit F5... I cannot explain when it occurs, because I was unable to find pattern.

Computer that is giving me the troubles is the one that Mario wants to smack. Here is the fun part, it cannot be accessed from another Windows computer (while timeouts occur), but it can be from the Linux one. After timeout message occurs (about 30s later), it is usually working again, if not, I have to restart Apache. They are connected wirelessly to a cheap D-Link router, and later via cable.
When everything is functioning:
- I can access from any computer
- I can access from outside (internet) via DynDNS
- I can access network (sharing) without problems
- I have no headache
When it's not:
- I can't access via HTTP (
http://192.168.0.111) - I can't access from outside (internet) via DynDNS
- I can access network (sharing) without problems
- I can access from Linux computer in network
- I can access from computer in question (
http://127.0.0.1) - I have a mild headache
What have I tried:
- Set MTU to 1500 everywhere
- Updated Apache to 2.4.2 - 32bit
- Disabled all F!r3w411z
- Connected computer in question via Ethernet cable (timeouts are less frequent)
Extra:
I do have 2-3 vhosts defined like this:
Listen *:1337
<VirtualHost *:1337>
ServerName l337
DocumentRoot C:/git/1337
<Directory "C:/git/1337">
Options Indexes FollowSymLinks Includes ExecCGI
AllowOverride All
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
If question is too localized please do tell. Something similar: http://www.xinotes.org/notes/note/1777/
Thank you for your time.
P.S. I have tried turning it off and on again.

error.log? – Mathias R. Jessen Jul 16 '12 at 20:22[Sat Jul 14 14:44:51.222471 2012] [access_compat:error] [pid 796:tid 1112] [client 192.168.0.101:59959] AH01797: client denied by server configuration: C:/apache2, referer: http://192.168.0.111:1337/fam/, however, I can't seem to find where is C:/apache2 from because it is C:/apache... – webarto Jul 16 '12 at 21:47