Issues accessing secure sites

All of the sudden I'm unable to access secure sites. I have a DNS server setup. Today the server is unable to access secure sites (for example usbank.com, paypal.com etc.)... I have no issues accessing yahoo.com or google.com (for example)... Obviously since this is happening on my DNS/DHCP server the client machines are having the same issues... Same issue with IE or FireFox.
Any ideas or suggestions would be greatly appreciated.
Thank you very much!!
bkdavisAsked:
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JohnBusiness Consultant (Owner)Commented:
Can you reset the DNS settings?  Also try 8.8.8.8 as Primary DNS server to see if that helps.
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rgormanCommented:
Did you check your DNS cache to see if it is a lookup issue?
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bkdavisAuthor Commented:
Setting my primary DNS address to 8.8.8.8 on my DNS server's NIC did not help... Is that what you're suggesting?
Can you please explain in more detail how to check my DNS cache?
Thank you very much
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rgormanCommented:
On your DNS server launch the DNS admin tool and turn on the Advanced view from the View menu of the MMC.  From there you should see a CACHED LOOKUPS folder open and you can navigate that to see the cached DNS entries from the look ups that have been done.  If it is missing host records for the sites you are trying to access then it could be a lookup/DNS issue.  You would know that by pinging the hosts FQDN anyways if it doesn't come back with an IP.
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KromptonCommented:
Are you able to ping these sites? Can you access the website by entering the ip as the url?
Is it just your server or are client machines using this dns server also unable to access those sites?
Have you tried using another user account that has NOT logged into the problem machine before? This ensures a new ntuser.dat or HKCU hive is created.
If clients are also having problems try the 8.8.8.8 dns setting as suggested earlier on the client.

Krompton
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bkdavisAuthor Commented:
When I try to ping these secure sites from the DNS/DHCP (also DC) server I am not getting a reply. I'm also not able to access by typing in the IP. Same from the client machines.
When I enter 8.8.8.8 as the primary DNS (no secondary) I'm still not able to access these sites (from the server or client machines).
Logging in as a brand new user doesn't seem to help either.
I'm 3 hours away from this client but I've called the ISP and verified there are no issues on their end. I've disabled my antivirus (trendmicro) and still unable to access. I do have a sonicwall TZ100 (firewall) setup but I'm not seeing how that would be causing any issues.
When I looked at the DNS cache records I'm seeing quite a few folders. Is there anything I should be looking for?
Any other suggestions/ideas would be greatly appreciated.
Thank you for you time!
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JohnBusiness Consultant (Owner)Commented:
Did you try updating the firmware on the router as a possible solution?
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KromptonCommented:
Firmware, as John suggests, is worth a try.

Before that you may want to try restarting the sonicwall and your ISP router/modem device, if you haven't done that already.

Also, after the router/modem restart, try connecting a machine, bypassing the sonicwall. If you are still unable to access these sites I would take the matter up with your ISP again relating that information.

Krompton
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bkdavisAuthor Commented:
Thank you so much. Rebooting the router seemed to do the trick... Sometimes it's the simple things that we forget to try.
Very much appreciated!!
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JohnBusiness Consultant (Owner)Commented:
@bkdavis  - Thanks and I was happy to help.
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KromptonCommented:
You're very welcome. Glad we could help.

Cheers,
Krompton
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