accessing

Accessing webpage, clear dns cache
Hello,
Since a few weeks ago we need on a daily basis to access a webpage https://ww8.irooms.net  from our small business network. The page was from the beginning not accessible for us unknown reason.
It turned out that when we cleared the cache on our DNS server (installed on SBS 2008) we could access the page. Every few days that page becomes inaccessible again until the cache is cleared.
Does someone know how this problem can be solved without manually having to clear DNS cache every few days?
Thank You.
Best regards,
Zoran
zoran_grdicAsked:
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Mino DCCommented:
you can enable DNS first ths Scavenge and for clear automatically dns cache you can do a file .bat that you run at user login .

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Mino DCCommented:
when you have this problem which event there are in web server
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zoran_grdicAuthor Commented:
Thanks for the quick response.
Internet Explorer cannot display the webpage (diagnose internet connection) is the error in web browser, if that’s what you mean.

I don't really understand what you mean with Scavenge. I understand that a .bat file for automatic clearing the cache on the DNS server would do the job...but still I would like to know why is this happening in the first place.
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DrDave242Commented:
From your description, it sounds like that site's IP address is changing every few days for some reason.  Your SBS server caches the address of the site in order to speed future lookups, but when the site's address changes, the cached address on your server is wrong, so machines on your network can't access the site until the cached address is cleared.  Then, the next time someone on your network needs to resolve that site, your server queries a public DNS server (via either a forwarder or root hints, whichever you've got configured), determines the correct address, passes it to the client, and caches the new address.

If that site is hosted by someone else, you might try getting in touch with them to find out why the address changes every few days.
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zoran_grdicAuthor Commented:
Thank you. It sounds very reasonable. When I am accessing that site from my home (home cable internet connection) I can always access it without any problem.  I don’t get it.

Is it possible to configure our DNS server not to cache certain web addresses?
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DrDave242Commented:
Sorry, I don't know of a way to disable caching of certain addresses.  Make sure the "Secure cache against pollution" setting is enabled on your server, though:  Open the DNS console, right-click on the server, and select Properties.  The setting is under the Advanced tab.  It's enabled by default, so it should be enabled on your server, but it couldn't hurt to check.
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shauncroucherCommented:
Yes, this soun just like a well known bug in windows 2008 (and sbs 2008), seen it lots just lately;

http://support.microsoft.com/kb/968372

Shaun
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zoran_grdicAuthor Commented:
Thanks,
Should i change registry settings according to the KB968372?
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shauncroucherCommented:
Yes, either make the change to MAXCACHE as directed (restart DNS server service for good measure) or alternatively you could use forwarders which should also negate the issue.

Shaun
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zoran_grdicAuthor Commented:
If decided to use forwarders do I use than the internet service provider DNS server address?

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shauncroucherCommented:
Yes, they will provide you with DNS facility, ask them which servers to use, they will be able to advise (or you can look at the internet connection on your router and see what you get as DNS server dynamically)

Alternatively there are other recursive DNS services you can use such as the google public DNS service 8.8.8.8, and 8.8.4.4

Shaun
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zoran_grdicAuthor Commented:
problem solved
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