Internet connectivity issue with iMac on Fortigate 310B through Wireless

One for the experts here.
I have an office wireless LAN which uses Fortigate Access Points connected to a Fortigate 310B router... This equipment has been in place and functioning perfectly for months with Windows clients.
Recently, I had reason to try and conect an iMac to the system.

The iMac finds the SSID, connects correctly, pings, tracert etc work just fine but there is no Internet either on Safari or anything else...
telnetting also appears not to work.

I tested the iMac on another WLAN and it worked just fine, so it's not a faulty iMac.

I have a feeling that there's a setting somewhere on the Fortigate that is blocking the Internet traffic from being returned to the Mac..... can anyone help?
dangermouse1977Asked:
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dangermouse1977Connect With a Mentor Author Commented:
This issue turned out to be a faulty wireless card within the Mac, it wasn't a firewall issue at all.
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strungCommented:
Maybe a DNS issue. Do the Macs acquire a legitimate IP address?

Try setting fixed DNS settings in the Mac's network prefs.

Try using

8.8.8.8
and
8.8.4.4

which are Google's public DNS servers.
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dangermouse1977Author Commented:
Yep, the Mac gets a legitimate IP address, DNS is assigned as per the settings in the Fortigate.
Just in case, i set a static IP address and defined the DNS (using 8.8.8.8 as suggested)
no change, the Mac still can't display Internet pages.
Also, tried leaving the IP address on DHCP but manually setting the DNS, still didn't work.
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dangermouse1977Author Commented:
Any other suggestions on this one?
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strungCommented:
I presume you do not have MAC address authentication turned on on the Fortinet?

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dangermouse1977Author Commented:
Nope, no MAC authentication at all..... Windows clients just connect to it and work.
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dangermouse1977Author Commented:
accepting my own comment as the resolution wasn't actually related to the question I asked.
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