My network has eight computers using Win 7 Pro on a domain on SBS 2008 Standard. This is connected through a switch and Cisco PIX through a cable modem.
I was using the Internet last night and got up to grab a drink and when I returned, the Internet would not work. All of the computers were still connected, e.g. could connect vial remote desktop as well as to the server. All had their same ipconfig. I was not able to ping the internal address of the router.
For whatever reason, the router seemed like it was the problem, maybe because the light for the power was on, and where the cable from the modem was connected but not any from ports 1 through 4 out to the switch.
I tried accessing the Internet by circumventing the server using a static IP address and the DNS addresses from Roadrunner. This did not work, however.
Today, I grabbed a Linksys router just to see what happened. I entered:
72.45.xxx.92 (static IP)
72.45.xxx.91 (default gateway)
These DNS addresses are entered on the server as DNS forwarders
The inside address was:
No DHCP was used on the router.
When this router was exchanged for the Cisco router, I was able to easily ping the default gateway, 192.168.1.1 and, actually, the static IP address, which I guess is not a good thing, but it could. And, other than these settings, it was all factory defaults.
Everything else seems to be normal. The server has all of the same settings as before. DHCP is still enabled.
One strange thing that may mean nothing is that seven client computers and the server in Network and Sharing Center show a red X between the domain and the Internet (globe). This would be expected. My computer, however, shows a normal connection, even though it cannot access the Internet.
I cannot ping any websites.
I am rather perplexed as it just happened. I guess when something breaks it is working one second than not working the next. But, usually, when something gets broken on the network, I was the one who broke it.
It would seem that the most likely issue would reside with the router or the modem. The switch, obviously, works fine.
Hopefully, from this, someone can help. But, I also have a couple of questions on troubleshooting. First, is there an easy way to test the modem. Can I take a laptop and connect it or use the router? We also have a separate network which is used for VoIP. It's router is configured differently and uses the settings of the host for out VoIP. It uses DSL. I certainly don't want to change any settings unless they are easy as the router is responsible for our phone system. Having the Internet down has already slowed us to a crawl.
I don't really want to call Time Warner to check the modem if that is not a good idea. First, they would likely charge something. Also, just for an FYI, there are two businesses in this one building and Time Warner provides cable for us both. Both lines enter the building at the same junction. I don't see how that really lowers the chance of its being TW, but I suppose if you go back to the cable lines, one outage would affect us both. They are fine.
I appreciate your help. I apologize for the long question. I guess it is because I can finally type at home rather than Swyping on my smartphone all day.