Can't access outside websites sometimes
Posted on 2013-12-12
I have an issue with outside webpages not coming up (google, yahoo, Microsoft…etc.)
Last two weeks we have been having a random hand full of users that fire up there computers in the morning and all is good, then later in the morning or midafternoon they can’t access any outside webpages. Can access inside (internally hosted websites) webpages. And not always the same users.
We have two internal DNS servers (2008 R2) that have been running smooth for a couple years now with no major updates or configurations. The only DNS logs on server show is an invalid domain name packet that is reject every now and then. I have restarted DNS services on server, Restarted DNS servers.
When this happens to the users, I can still ping the outside world from client (google, Microsoft …etc.), even get an nslookup. But no outside webpages come up. (just blank white page saying “Can’t find webpage”)
At first I thought this was related to Internet Explorer 11, but couple days later users with 9, and 10 started having the same issue. (all users are windows 7 boxes)
Ipconfig all looks good on clients (show right gateways and DNS servers, and good DHCP IP addy).
On the client I have tried just about everything I can think of, including:
Cleaning out temp files (%temp%)
Scan clients for viruses\malware (Antivirus\malwarebytes) "negative"
Flushing client DNS
Registering client DNS (ipconfig /registerdns)
Disable/enable network adapter
Updating network adapter driver
Installing a second network adapter card
Shutting down computer (hard shutdown), restarting
Checking system files (System File Checker – sfc /scannow)
We are using Internet Explorer ( I know, there is better, faster – It is what the our vendors support)
Not wanting to make this a “chrome, firefox” shootout….feels more like a DNS issue somehow, but can’t figure it out.
Everything works fine for everyone else, just these random few, and always different users.
We are not running a firewall inside and client firewalls are turn off. We have a Cisco firewall coming into domain (nothing change here – even restarted router and switches).
Bottom line, everything works good except for 1-2 hours in the day, some in the morning and some in the afternoon. And always just a few users.
Looking for any help……Let me know if you need any more info.
Thanks in advance.