Can't access website from inside company network

The network is an Active Directory domain with 2003 SBS DC and 2012 Foundation DC.  DNS is running on both DCs and replication is good.  Access to a couple of websites (www.gatewayedi.com and the login of www.watrust.com) doesn't happen - just hangs.  I can ping both the sites by name and IP address but can't access from any client or either of the DCs.  Forwarders for both DCs point to the ISP DNS Server addresses as well as 8.8.8.8.  All other access to the internet seems to be fine.  I have read through several articles and most are talking about issues accessing the external websites of the company - this seems to be a different situation.  Help please.
NCProsAsked:
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NCProsAuthor Commented:
Fixed the problem - had to adjust the MTU on the edge router and the sites are now accessible.  Thank you for your help
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footechCommented:
If you're able to ping by name, then DNS resolution is working fine.
How long has the problem been happening?
I would run a tracert to both of the sites, or use a tool like PingPlotter, to see if there is problem somewhere along the route.  If this is a new issue, most likely the problem has to do with one of the routing points in the internet.  Other people may be able to reach the site fine if the route their traffic takes is different from yours and thus doesn't run into the trouble spot.
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NCProsAuthor Commented:
I ran tracert www.gatewayedi.com from one of the DCs and also from my PC (in a different company).  They do use different routes but the last route is the same.  When I try to access the website from the DC, it acts like it's resolving then just hangs there, like it's waiting for some type of input or a browser add-on is missing - but no alerts pop up.  Using Interent Explorer
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Mike RoeCommented:
any firewall/antivirus setup on the machines in question
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NCProsAuthor Commented:
None on the DCs or the edge router
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footechCommented:
How long has the problem been happening?
Still sounds like a problem with the Internet routing to me.
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NCProsAuthor Commented:
The problem started this week - Tuesday.
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Mike RoeCommented:
change forwarders from isp to public DNS other than google and see if it works
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NCProsAuthor Commented:
I took out the forwarders off of the 2012 DC and installed OpenDNS ip addresses:
208.67.222.222
208.67.220.220
Still no change.  I can ping the website from the command line but can't connect in a browser.
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Mike RoeCommented:
scan for virus/malware
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NCProsAuthor Commented:
I ran malwarebytes on both DCs - nothing found and still no access to those websites
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Mike RoeCommented:
anywhere in your DNS do you hasve a static entry that points to this website be it is wrong address
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NCProsAuthor Commented:
Checked the settings on the firewall and overlooked some things
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