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What is the web site and what browser are you using to connect to it? &nbsp;You might try moving one of the computers with the problem to a different modem to see if the problem follows the computer. &nbsp;If it does, then the computer is the problem and not the modem.
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What is the web site and what browser are you using to connect to it?  You might try moving one of the computers with the problem to a different modem to see if the problem follows the computer.  If it does, then the computer is the problem and not the modem.

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Try pinging the problem website from each Mac and seeing if the name resolve to a different IP address on the computers that can connect from the ones that can't.<br />
<br />
Also try trace route.
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Try pinging the problem website from each Mac and seeing if the name resolve to a different IP address on the computers that can connect from the ones that can't.

Also try trace route.

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Also on each Mac go to the Network settings, hit the Advance button, then the DNS tab and see if all Macs are using the same DNS server.
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Also on each Mac go to the Network settings, hit the Advance button, then the DNS tab and see if all Macs are using the same DNS server.

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Found out what the problem was. &nbsp;Was our ISP
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Found out what the problem was.  Was our ISP

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4 Netgear N600 modems connected to 4+ Macs.<br />
<br />
Modems are working normally except that 2 can see a specific web site and 2 cannot. The 2 problem modems can see all other sites. Problem started 4 hours ago.<br />
<br />
Power cycling network?<br />
<br />
Have tried powering down, hard reset, clearing caches and cookies.<br />
<br />
Does anyone have any thoughts please? There are some, old, Google mentions but no solutions.
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4 Netgear N600 modems connected to 4+ Macs.

Modems are working normally except that 2 can see a specific web site and 2 cannot. The 2 problem modems can see all other sites. Problem started 4 hours ago.

Power cycling network?

Have tried powering down, hard reset, clearing caches and cookies.

Does anyone have any thoughts please? There are some, old, Google mentions but no solutions.

OS X Modems Not Connecting to SIngle Specific Web SIte

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).

Broadband

Apple devices including Macs, iPhones, iPods and iPad support standard wired and wireless networking technologies, but they also utilize custom applications and some special techniques for networking with each other and with non-Apple devices. Apple manufacturers the AirPort line of wireless networking products, and has its own networking protocols, AppleTalk and AFP (Apple Filing Protocol).