Behind home router, can't get to a certain website

At a house with a basic setup. Router and wifi; multiple PCs connected. All computers on the network are able to use the internet without problems. None of the computers can get to a specific site, http://www.ebsconsultants.net (resolves to 67.225.188.103). CAN see this website from multiple other locations on those same computers. There are no known RBLs on the site.

It's an ATT U-verse router (don't have the model number).
-Basic settings on the router.
-DHCP.
-Firewall is in default mode.
-Reset the router - didn't help.
-Neither Mac and PCs can't reach the domain.
-Tried using OpenDNS on the computer
-Can even ping to 67.255.188.102 and 104 (hence to the same web/mail host), but not 103.
-Able to surf to anything else attempted, except this website.

Why is this one IP and domain causing a problem?

What else to try?
mapski99Asked:
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mapski99Connect With a Mentor Author Commented:
Ran into the same problem at another person's house. Two computers were fine, able to access ebsconsultants.net. Then added the third machine, and instantly no one was able to connect to ebsconsultants. Becuase this was nearly instant, it seemed like some sort of virus or a DNS trojan. But the fact that it blocks one site only made no sense.

Eventually got the access to the webhost and found out they were blocking the domains due to "perceived" cracking. The suspect computer was checking email every minute. This was seen as nefarious, thus the entire network was blocked.

Changed settings in outlook, had their web/mail host remove the block, and everything is dandy.
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John HurstBusiness Consultant (Owner)Commented:
It is within reason that your ISP has somehow blacklisted it or purchased a block of IP's that the site doesn't like. The IP that I have at home currently was purchased by my ISP and it had been blacklisted, so that for a while, I had great difficulty getting email at home. I usually had to resort to dialup to get mail. All fixed now. ... Thinkpads_User
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mapski99Author Commented:
It's possible, but unlikely.

I'll call AT+T check to see... although they probably won't have a clue ;-)
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johnb6767Commented:
I am on UVerse in Houston, and I can browse that url just fine.

Pinging it by name....

C:\Users\John>ping www.ebsconsultants.net

Pinging ebsconsultants.net [67.225.188.103] with 32 bytes of data:

Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=81ms TTL=49

Pinging it by IP....
C:\Users\John>ping 67.225.188.103

Pinging 67.225.188.103 with 32 bytes of data:

Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=80ms TTL=49
Reply from 67.225.188.103: bytes=32 time=80ms TTL=49

Ping statistics for 67.225.188.103:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 80ms, Maximum = 80ms, Average = 80ms

Gotta be a routing issue of some sort there....

BTW....

"Can even ping to 67.255.188.102 and 104 (hence to the same web/mail host), but not 103."

Got a typo in your IP there....
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John HurstBusiness Consultant (Owner)Commented:
Try doing a hard reset on the router and re-configuring it. Note your important settings first.

You say at least one computer can go to another location (ISP) and get to the required website fine, so I think it to be unlikely is the computer.

I agree it is not likely to be ATT be at least call them.

That only leaves the router at this point (your OP suggests the router and modem are combined - correct me please if I got this wrong).
... Thinkpads_User
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mapski99Author Commented:
thinkpads_user,

Did a hard reset on the router already.
EVERY computer in the house can connect to and use the internet
NONE of the computers in the house can connect to http://www.ebsconsultants.net 

Router is a combo DSL modem+router+wifi
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John HurstBusiness Consultant (Owner)Commented:
It has to be something with the router or something with the ISP. They are the only two variables given that at least one of these computers can get to the site using a different ISP.

One possibility is to borrow a decent router, configure it to be the main router, DHCP server and such. Set the modem (if necessary) to bridge across to the router and do nothing else. Connect a computer with an ethernet cable to the router and see what happens.
... Thinkpads_User
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johnb6767Commented:
Wow... good find..... Thanks for the resolution....
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mapski99Author Commented:
Hey peps, thanks for all of the input.

Outlook checking mail every minute was the problem. Mail host banned the IP address of any domain the user connected to.

The host un-bans after a few weeks.

The symptoms were such that it was difficult to pinpoint the issue, and I couldn't get direct access to the mail host, due to a reseller account.

My advice to all, and one we hate to do... CALL the email/web host immediately. Ask if there are any blocked IPs. (In this case, liquidweb.com VPS support picked up immediately and was awesome... this is not your standard hosted web support staff!!!!)
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