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For some reason, we are blocked from accessing our external website from within our company network.

For example. from the company network, only http://www.companyname.com works, but http://companyname.com does not work.

If I try http://www.companyname.com and http://companyname.com from home, both work properly.

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What IP does companyname.com resolve to within your company network and is it different to www.companyname.com? – Ethos Feb 21 '11 at 11:08
I don't know the answer to the first question, but the answer to the second question is that it is definitely different from www.companyname.com. – oshirowanen Feb 21 '11 at 11:43
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2 Answers

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You should talk to your system administrator about this as it sounds like your company is using split DNS and the internal DNS doesn't have a record for companyname.com.

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Thanks, will speak to sys admin. – oshirowanen Feb 21 '11 at 11:42
The sys admin has added a 'www' A record to the companyname.com zone, and it makes no difference. – oshirowanen Feb 21 '11 at 14:10
@oshirowanen, as www was already working the admin needs to add the appropriate record for letting you get to the site without needing www. – John Gardeniers Feb 21 '11 at 19:03
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It sounds like your active directory domain may also be companyname.com, if not then it sounds like your internal DNS server does not have the correct records for it.

Add a new A record for company.com on your internal DNS server pointing to your external website. If company.com is your internal domain name then I would not recommend doing this. You might look at creating a new internal only record for this, something like http://website/ which does a redirect to www.companyname.com. Not ideal but the only solution I can think of.

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I think you might be right. We are using company.com for our active directory domain. – oshirowanen Feb 21 '11 at 11:41
in that instance company.com should always resolve to one of your domain controllers. – pablo Feb 21 '11 at 13:15
I don't understand? When I type companyname.com. I get a host refused connection error message in the browser, even though it works from my phone which is not using the network I am trying to access it from. – oshirowanen Feb 21 '11 at 14:09
from a command prompt type nslookup companyname.com. It will likely return the ip of your domain controller, rather than your website. Active Directory doesn't know its a website, it just knows that its your internal domain name. – pablo Feb 21 '11 at 15:55
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