Https connections working but not http

touchman
touchman used Ask the Experts™
on
Hi guys.

We have two branches setup as a wan through cisco routers. I will call one branch A and one branch B . Our dns server is at branch B which both branches use. Both networks are on different subnets. branch A's is recieved from the router. and branch B is recieved from a dhcp server. Everything at branch B works great with no issues. And all connections between branches have no problems. but branch A has problems connecting to web pages. sometimes a site or two will work but very slowly and the rest of the time they just time out. But if i go to the url on a secure connection it works fine. We have had someone in to look at the routers to make sure they are set up right. Both branches are with different isp's and only branch B's isp dns server are in the onsite dns server. Really we need http connections to work and not just https because the main sites we use dont have https.

Any ideas on this would be great.

Thanks in advance for any help :)
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Author

Commented:
Hi, have tried those things. This happens on all browsers btw. I think its more of a network setup problem. but i just cant think of anywhere else to look and check. so i was hoping someone would be able to say check this or this and hopefully have some luck.
Top Expert 2013

Commented:
touchman--Long shot.  See if you are using a Proxy and if so, turn it off.
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Author

Commented:
Hi Icimarron no not using a proxy. okay the sites that werent working yesturday and half teh time are now working. but now another main site that was working is now not working at Branch A yet branch B is always fine

Author

Commented:
This is the message they recieve in chrome when trying to access most webpages

Reload this web page later.
Check your Internet connection. Reboot any routers, modems or other network devices that you may be using.
Check your DNS settings. Contact your network administrator if you're not sure what this means.
Try disabling DNS prefetching by following these steps: Go to Spanner menu > Options > Under the Bonnet and deselect "Use DNS pre-fetching to improve page load performance".
Try adding Google Chrome as a permitted programme in your firewall or antivirus software's settings. If it is already a permitted programme, try deleting it from the list of permitted programmes and adding it again.
If you use a proxy server, check your proxy settings or check with your network administrator to make sure that the proxy server is working.
If you don't believe that you should be using a proxy server, try the following steps: Go to Spanner menu > Options > Under the Hood > Change proxy settings > LAN Settings and deselect "Use a proxy server for your LAN".
Error 105 (net::ERR_NAME_NOT_RESOLVED): Unable to resolve the server's DNS address.

Author

Commented:
At teh bottom i see it says Unable to resolve servers dns address. but thats only at branch A at branch B everything is fine. and we are pointing to the same dns server at branch B. the only difference is branch B is on ip range of 192.168.5. and branch A is on 192.168.1.

Author

Commented:
BTW skype and email and everything work fine all the time.

Author

Commented:
Just noticed while going through all the config that Site A does not have a reverse lookup zone in our dns server. Could this be causing this intemittance?
Commented:
Turns out we were using open dns on our server and this is what was causing all of this. changed teh servers to the normal ISP ones and all is solved.

Author

Commented:
Would of been hard for anyone to figure this out as i at teh time did not know we were using open dns either.

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