Mac Pro can access other Macs but those same Macs cannot access the Mac Pro

Hello.
I have a highly annoying problem that goes as follows:
My (home) network consists of:
- 1 Mac Pro (e2008 - 10.5.6)
- 1 iMac (2008 - 10.5.6)
- 1 MacMini (2004 - 10.4.??)
- 1 MacBook Air (2008 - 10.5.6)
The internet connection is alive and well with no drops not that it truely matters here.
The setup is as follows:
- Linksys AM300 in half bridge mode connects to the
- Apple Airport Extreme Base station from which 1 cat6 cable runs to the
- Mac Pro
The other Macs connected to the Airport Extreme wirelessly.
The Mac Pro has its network settings setup correctly (in fact it used to work fine but then just stopped working) and I have also disabled all network settings, rebooted and reapplied the settings to no effect.
To clarify:
I (Mac Pro) can connect to all Macs in the network but all those macs can see me but not connect to me. Connecting via the Finder simply says "Connection Failed" and if I open the "Connect to server.." and enter the IP address of the Mac Pro it results in an error/failed connection also.
Any ideas to fix this would be highly appreciated.
PS: As of now, 19/03/2009, I have all software updates installed on all macs in the network.

Place the files you want to transfer on the Desktop
Click on the Finder or desktop to swtich to Finder, then Go > Computer, then double click on the boot drive, then on the Users folder.
Open the target User folder and inside is a Public folder > Drop Box, just drag and drop in there and the permissions change so that user can use the file.

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Mac Pro can access other Macs but those same Macs cannot access the Mac Pro

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