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I can't access some websites from a subset of computers on our work network - and it's really random. Examples of sites I can't access:


Our provider (Verizon) swears that everything is good on their end. We've tried rebooting the router - to no avail. Out of 10 PCs in the office, 4 of them can't access the sites above.

I've tried comparing tracert between a site that I can and cannot access. The only meaningful difference I see is that after leaving the Verizon network, the non-accessible sites go through, while accessible ones do not.

Here is the tracert from hitting google.com (accessible)
L200.LSANCA-DSL-55.verizon-gni.net []
G0-10-0-4.LSANCA-LCR-21.verizon-gni.net []
ae4-0.LAX01-BB-RTR1.verizon-gni.net []
0.ae3.XL3.LAX15.ALTER.NET []
TenGigE0-4-2-0.GW4.LAX15.ALTER.NET []
google-gw.customer.alter.net []
lax04s08-in-f19.1e100.net []

Here is the tracert from hitting digium.com (non-accessible)
 L200.LSANCA-DSL-55.verizon-gni.net []
 G0-6-0-4.LSANCA-LCR-21.verizon-gni.net []
 0.xe-4-1-0.BR1.LAX15.ALTER.NET []
sl-st20-chi-4-0-0.sprintlink.net []
hsv3.gig1-2.apid.com []
Request timed out.

The problem started occurring sometimes last week. How can I troubleshoot it?
P.S. The problematic machines are a mix of Win7 and XP (as are the non-problematic ones)

share|improve this question
I don't know what's causing it however I can tell you that as long as 6 of the PCs can access the website, it's an internal error of the computers, not Verizon. –  Chipperyman Jun 22 '13 at 3:51
can you show us ROUTE PRINT output from problematic ones? –  dusan.bajic Jun 22 '13 at 7:12

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