puzzled ... DNS?

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I have a client that is experiencing a few problems that have me puzzled. I have configured the DNS server to point to the ISP DNS IP addresses. All clients point to the server ip address 192.168.0.100. The name of teh Dns server is say, servername.companyname.com. The web site is www.companyname.com. All clients can get n the internet and send/receive email. But, they can not go to their own web site, www.companyname.com. If I go to the command prompt to do nslookup and type www.mycompany.com ... it says "unknown, can't find www.mycompany.com: non-existent domain." If I type www.mycompany.com in my browser outside the network, I go right to their web site. I assume therefore it must be a DNS configuration ... any thoughts/ideas

Thanks
 
TomR said:
I have a client that is experiencing a few problems that have me puzzled.
I have configured the DNS server to point to the ISP DNS IP addresses. All
clients point to the server ip address 192.168.0.100. The name of teh Dns
server is say, servername.companyname.com. The web site is
www.companyname.com. All clients can get n the internet and send/receive
email. But, they can not go to their own web site, www.companyname.com. If
I go to the command prompt to do nslookup and type www.mycompany.com ... it
says "unknown, can't find www.mycompany.com: non-existent domain." If I
type www.mycompany.com in my browser outside the network, I go right to
their web site. I assume therefore it must be a DNS configuration ... any
thoughts/ideas?


You message above is pretty difficult to read but it sounds like a
problem common to those who are either new to Win2000+ or
who don't understand DNS (or both).

You need all Windows clients configured to ONLY resolve
names through internal name servers, e.g., DNS. They must
reliabley resolve internal names.

If you use the same zone name internally and exteranlly for
your Domain and outside DNS name then you must duplicate
the external zone internally -- it's called "shadow DNS."

This means you have an external DNS server (set) with a
primary and an INTERNAL DNS server set with a primary
or equivalent.

Since DNS Primaries will never replicate with each other
you must define all EXTERNAL resources TWICE: once on
the external and again on the internal DNS zone.

Internally, you can add additional records -- and use dynamic
DNS -- without worrying about private records migrating to
the outside.

Also, make sure to configure the internal DNS servers and
DCs as internal clients too -- only internal DNS on their
NIC configuration too.
 
In
TomR said:
I have a client that is experiencing a few problems that have me
puzzled. I have configured the DNS server to point to the ISP DNS IP
addresses. All clients point to the server ip address 192.168.0.100.
The name of teh Dns server is say, servername.companyname.com. The
web site is www.companyname.com. All clients can get n the internet
and send/receive email. But, they can not go to their own web site,
www.companyname.com. If I go to the command prompt to do nslookup
and type www.mycompany.com ... it says "unknown, can't find
www.mycompany.com: non-existent domain." If I type www.mycompany.com
in my browser outside the network, I go right to their web site. I
assume therefore it must be a DNS configuration ... any
thoughts/ideas?

Thanks

In your internal DNS server's forward lookup zone, named "mycompany.com"
create a new host, name it www, give it the IP address of the website. You
may have to run ipconfig /flushdns before you can access the site, in case
the negative answer is still in cache.
 
Thanks ... quick follow up. I added www and the website IP address. This allows me to access the mycompany website from the server browser. When I try the same from another PC, I can not get the website. If I do an nslookup, I am returned the website and correct ip address. I've closed and restarted the browser. Shouldn't the www host record work for PC's on the network resolving through the server
Thanks.
 
In
TomR said:
Thanks ... quick follow up. I added www and the website IP address.
This allows me to access the mycompany website from the server
browser. When I try the same from another PC, I can not get the
website. If I do an nslookup, I am returned the website and correct
ip address. I've closed and restarted the browser. Shouldn't the
www host record work for PC's on the network resolving through the
server?
Thanks.

Yes, it should work. Did you flush the DNS resolver cache using the command
I gave?
Nslookup does not use the system cache, it has its own cache.
 
In
TomR said:
Yes I did, on the server. It works fine on the server ... I can
access the company's web page. They also have a Citrix server.
This computer can also access the Company web page. Unfortunately,
I've tested three other pc's on the network ... and they can not get
to the web page. Their DNS is the servers IP address, so they are
resolving through the server. When I run nslookup on the
workstations, it does return the correct ip address for the company
web site .... just can't get the web site via their browser. Any
further ideas or tests I might run from the client PC?

Thanks!


Are there any proxy settings on the client browsers?


--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory
 
Thanks ... no, checked about 3 that are not accessing the company web site. the network has the dns domain controller and is still running an NT PDC and wins server ... but think it is my DNS config
 
In
TomR said:
Thanks ... no, checked about 3 that are not accessing the company web
site. the network has the dns domain controller and is still running
an NT PDC and wins server ... but think it is my DNS config

Ok, now it's coming down to guessing... maybe it's a network config issue??

Maybe if you can help us out at this point... Please provide us an ipconfig
/all from a machine that is working and from a machine that is not working.

Thanks!

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory
 
In
Kevin D. Goodknecht said:
In Ace Fekay [MVP]
<PleaseSubstituteMyActualFirstName&[email protected]> posted a
question
Then Kevin replied below:



Where is the web site hosted?
What is the website address?



Kevin, are you thinking multiple CNAMES?

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory
 
T> When I run nslookup on the workstations, it does return the
T> correct ip address for the company web site .... just can't
T> get the web site via their browser.

Then your problem is a browser URL modification problem, an IP connectivity
problem, an HTTP proxying problem, an HTTP connectivity problem, or a content
HTTP service problem; not a DNS problem.

T> Any further ideas or tests I might run from the client PC?

Your web browser presents error messages that are slightly more detailed than
"cannot get to the web site". Read them.
 
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