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Some apps unable to access the Internet
Hello all, from a newly-joined member of the Forum. I hope someone can help me resolve a problem that's driving me slightly beserk!
A few weeks ago I did a completely fresh installation of a (fully licensed) version of 32-bit Win7 Pro on a Dell OptiPlex 780 platform, to replace the version of Vista that was originally installed on the machine. The machine has a 1Gbps wired connection to my ADSL router, a Billion 7800N - my ISP is Demon (now part of Vodafone).
The Win7 installation on the OptiPlex 780 proceeded pretty smoothly and after installing the Dell system-specific video, network and sound drivers I soon had the system up and running as I wanted it, and all seemed well, so I proceeded to install various apps including my preferred firewall (Comodo) and anti-virus (Avast!), followed by Firefox which I much prefer to IE.
During the course of installing various other apps I wanted to install Adobe Reader and Flash Player so I downloaded the installer 'stubs' and set the online installers running, but subsequently nothing at all happened - no further download activity, no error messages, nothing whatsoever even after leaving the system to its own devices for a few tens of minutes, and at no time did the Comodo firewall generate any alerts to indicate that a program was trying to get through the firewall and access the Internet. In the end I had to resort to downloading (using Firefox) and running the offline installers for the Adobe apps.
In the last couple of days I've found that when I instruct the Macrium Reflect backup and imaging software I've installed on the OptiPlex 780 to check the Macrium website for updates, the program just hangs without any indication of errors, and eventually I have to kill the app. Again, the Comodo firewall doesn't raise any alerts about the app trying to access the Internet.
I've also just tried to launch IE 11 and found that it just sits there, with the activity indicator spinning and displaying a status message that says "Waiting for a response from <website>..."
I'm able to use Firefox (32.0.1) on the OptiPlex 780 to browse the Internet without any problems whatsoever, and telnet from the 780 works entirely correctly not only to other machines on my 192.168.x.x LAN but also to addresses on the Internet, so the basic network connectivity is there and working, but for some reason IE 11 and the various other apps don't seem to be able to communicate with the Internet.
I've now uninstalled the Comodo firewall and Avast! anti-virus from the OptiPlex 780 and have reverted to using the Win7 firewall and MSE, to no effect - IE 11 and the Macrium Reflect updater still don't seem to be able to access the Internet.
I've tried using various netshell reset commands (int ip and winsock), as suggested on this forum for similar problems, but again these have made no difference.
IE 11 on another Win7 machine - a Dell Vostro laptop with a wireless connection to my router - works absolutely fine so there's nothing configured on the router that might be blocking the accesses from some of the apps on the 780 machine to the Internet.
Although I rarely need to use IE 11, it's a real bind not having it and various other apps, especially the Adobe installers/updaters and the Macrium Reflect updater, able to access the Internet but I'm at a complete loss to know what to try next to overcome the problem! It seems to me that something somewhere is blocking these apps' accesses to the Internet but I don't know where to look - temporarily disabling the Win7 firewall doesn't make any difference so it's not that that's doing the blocking!
Has anyone else experienced a similar problem and found a solution??!! I really don't want to have to reinstall the entire O/S and all the apps just to overcome the problem.
Thanks in advance
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Martin
Last edited by dma5m561; 15 Sep 2014 at 10:26.