Unable To Connect To Some Sites

I am unable to connect to some sites, with the error message "Safari can’t connect to the server." I cannot connect to the site with Firefox either.
Example sites are: www.bostonpizza.com and www.airmiles.ca
However, I am able to connect to these sites when I boot into WinXP.
I have tried pinging the sites in question, getting the following error message: "ping: sendto: No route to host"
It looks like something is bonked with my OS X settings. I have tried the following without any luck:
1. Reseting the computer
2. Clearing Safari's cache
3. Reseting PRAM settings using OptCmd+pr key commands on startup
4. Using OpenDNS in the network DNS settings
I am connected directly to a Linksys ADSL Ethernet modem, and my firewall is set to allow all incoming connections. I'm not running PeerGuardian, and as far as I know I'm not running anything in the background that would bork my network.
Any help or suggestions would be greatly appreciated.
Thanks,
Orest
I have tried doing a traceroute when running in WinXP, with the following information:
racing route to www.bostonpizza.com [64.40.107.95]
over a maximum of 30 hops:
1 8 ms 8 ms 8 ms d75-152-160-1.abhsia.telus.net [75.152.160.1]
2 7 ms 7 ms 7 ms 154.11.184.193
3 9 ms 8 ms 7 ms peer.clgrab21gr02.bb.telus.com [154.11.3.42]
4 20 ms 20 ms 20 ms rc2wh-pos0-0-2-0.vc.shawcable.net [66.163.77.197]
5 20 ms 20 ms 20 ms ra2wh-tge2-1.vc.shawcable.net [66.163.69.186]
6 22 ms 21 ms 21 ms rx0wh-net-nation.vc.bigpipeinc.com [64.251.87.170]
7 21 ms 21 ms 21 ms www.bostonpizza.com [64.40.107.95]
Trace complete.

Thanks for the replies, unfortunately I still haven't resolved the issue. I would say 99% of the sites I visit work fine, but for some reason the odd site won't work.
This is the results for the ping on my Mac OS X system:
PING www.bostonpizza.com (64.40.107.95): 56 data bytes
ping: sendto: No route to host
I can access the site running WinXP in Parallels, and I can access the site in question when I use bootcamp to boot into WinXP, using the same network hardware and same connections.
It looks like from the ping, DNS is working and able to translate the site name, but for some reason cannot access the site.
This is the results of a traceroute that I ran while booted in WinXP:
Tracing route to www.bostonpizza.com [64.40.107.95]
over a maximum of 30 hops:
1 8 ms 8 ms 8 ms d75-152-160-1.abhsia.telus.net [75.152.160.1]
2 7 ms 7 ms 7 ms 154.11.184.193
3 9 ms 8 ms 7 ms peer.clgrab21gr02.bb.telus.com [154.11.3.42]
4 20 ms 20 ms 20 ms rc2wh-pos0-0-2-0.vc.shawcable.net [66.163.77.197]
5 20 ms 20 ms 20 ms ra2wh-tge2-1.vc.shawcable.net [66.163.69.186]
6 22 ms 21 ms 21 ms rx0wh-net-nation.vc.bigpipeinc.com [64.251.87.170]
7 21 ms 21 ms 21 ms www.bostonpizza.com [64.40.107.95]
Trace complete.
When booted in Mac OS X, I am able to ping every listed IP address in the WinXP traceroute, except for the last one, 64.40.107.95.
Still no idea what is going on, my network troubleshooting toolbox consists of pretty much ping, and googling error messages.
Thanks,
Orest

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Tracing route to s4gru.com [50.28.75.70]
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1 <1 ms <1 ms <1 ms 192.168.1.1
2 6 ms 6 ms 6 ms L100.DLLSTX-VFTTP-61.verizon-gni.net [<redacted for privacy>]
3 9 ms 11 ms 9 ms G0-5-4-5.DLLSTX-LCR-21.verizon-gni.net [130.81.107.42]
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5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 54 ms 34 ms 48 ms 0.ae1.XL3.CHI13.ALTER.NET [140.222.225.179]
10 44 ms 41 ms 47 ms TenGigE0-6-0-0.GW5.CHI13.ALTER.NET [152.63.66.190]
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15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.
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C:\Users\xx>
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1 <1 ms <1 ms <1 ms 192.168.1.1
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5 9 ms 9 ms 9 ms 0.xe-3-3-1.BR2.DFW13.ALTER.NET [152.63.100.117]
6 * * * Request timed out.
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9 60 ms 61 ms 59 ms ae-2-2.ebr1.Denver1.Level3.net [4.69.132.105]
10 61 ms 53 ms 56 ms ae-1-100.ebr2.Denver1.Level3.net [4.69.151.182]
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14 43 ms 41 ms 44 ms g1-41.r-core-msp-a.binc.net [64.73.128.113]
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Help please!
Solved!
Go to Solution.

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