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Internet connectivity issue with iMac on Fortigate 310B through Wireless

Posted on 2011-09-22
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Last Modified: 2012-05-12
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?
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Question by:dangermouse1977
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Expert Comment

by:strung
ID: 36580288
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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Author Comment

by:dangermouse1977
ID: 36582167
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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Author Comment

by:dangermouse1977
ID: 36595131
Any other suggestions on this one?
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Expert Comment

by:strung
ID: 36595291
I presume you do not have MAC address authentication turned on on the Fortinet?

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Author Comment

by:dangermouse1977
ID: 36597064
Nope, no MAC authentication at all..... Windows clients just connect to it and work.
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Accepted Solution

by:
dangermouse1977 earned 0 total points
ID: 37166298
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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Author Closing Comment

by:dangermouse1977
ID: 37187562
accepting my own comment as the resolution wasn't actually related to the question I asked.
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