Weird Airport behaviour when connecting to specific servers on the internet

Hi Mac-Gurus,
I have a very strange problem with my MacBook Pro which is a Intel Core 2 Duo, 2.2 GHz, bought in November 2007 running OS X 10.5.5.
My WLAN router is a Netscreen 5-GT with WPA2 encryption. Airport Extreme (0x168C, 0x87) firmware 1.4.8.0
When I'm trying to connect to the server 80.239.233.98 on port 3724 (which is a world of warcraft logon-server) the connection cannot be established and the network utility shows receive errors on the Airport Extrme interface en1.
When I'm using the onboard gigabit ethernet there is no problem connecting to the server. Also there is no problem connecting from a Windows XP Notebook via WLAN to the server.
I already tried the following things:
- I used a packet sniffer on my Netscreen-Firewall showing that IP packets are sent to the server 80.239.233.98 on port 3724
- the packet sniffer on the firewall also showed answers from the IP and that these are forwarded to the MacBook
- using tcpdump on my MacBook I can see TCP packtes going out, but an answer is never received
There is no additional firewall blocking traffic on my MacBook, my Netscreen Firewall is not blocking traffic to or from my MacBook.
When I manually enter my WLAN SSID and password and my Mac reconnects then it is sometimes possible, also only for a very little while, to access the server.
There seems to be something really buggy with the Airport Extreme Adapter since I can connect from a windows notebook over the same access point and more worse over the built in Ethernet.
Does someone have the same problem or better a solution for this? I really want to use my WLAN for all applications.
regards
Chris

Hello TrevorMurphy. Welcome to the Apple Discussions!
Typically when you can connect to the network but not to the Internet, your computer was unable to find the DHCP server in order to obtain its IP address information. In this case, this DHCP server would be provided by your home network's router.
I suggest trying the following to "refresh" the DHCP-provided IP addresses on your MacBook.
System Preferences > Network > AirPort > Advanced > TCP/IP > Renew DHCP Lease

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