I encountered a situation recently where browsing, email, etc appeared to work fine, and had worked fine for some time. However, recently when someone tried to log on to a certain site, a message popped up that the site wasn't available. I "pinged" the site, which is a way to go directly to the site without using a browser, and sure enough, the site was unreachable.
The first steps were to check the firewall(s) on the computer in question. Two firewalls were on, which is a no-no. I fixed the problem by turning off the Windows firewall.
I also checked on another computer- couldn't get to the web site either. It's firewall was OK.
To make a long story short, despite the fact that generally everything was working fine, the modem- the little black, silver or white box that connects to your telephone through that DSL adapter- was set up wrong. All this time...
The modem has to be set to "pass through" to any router... the specific option is "Bridged Ethernet." This disables the modem firewall; the router firewall takes over as the firewall and in controlling the internet activity.
The way it was set up, there were two firewalls turned on- a NO-NO in this particular situation.
So, if don't know if your internet connection is set up this way, let me know and I will check it for you.
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