Solved

Can ping/telnet to website, but can't browse to it.

Posted on 2008-06-23
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Last Modified: 2013-12-08
Good morning, experts.

I'm having some strange issue with a few of my servers.  


I'm trying to browse to a website hosted in my DMZ, however IE just hangs there and won't do anything.


I can ping the website.  I can telnet to the website using ports 80, 81, and 443.  That tells me this isn't a firewall issue.  Also, there is nothing of importance in my firewall logs.  Other servers on the same subnet can browse to the website just fine.  


I've also tried installing Firefox to see if it was an IE issue, but nothing.  



Any ideas?


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Question by:Rogiee
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by:exhaust
exhaust earned 50 total points
ID: 21847505
Can you try adding the exact URL you are having trouble with to IE's Trusted Site. Does it now allow you to load the website?
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by:Rogiee
ID: 21847536
@exhaust

Same results after adding.
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LVL 3

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by:exhaust
ID: 21847790
Ok, if you can telnet to these ports you definitely have an end to end network socket connection to it. It almost sounds like that the website your running isn't listening on the default ports. Check IIS (I'm assuming that's what you're using).
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by:jfields71
jfields71 earned 40 total points
ID: 21847825
Have you tried watching network traffic on the host to see what, if any, traffic is passing between the two machines?  Try Wireshark: http://www.wireshark.org/.  Perhaps packets are dropping or the connection is not being completed.

Also, have you tried a simple text tool like wget to see what is being transferred?  http://en.wikipedia.org/wiki/Wget.  
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by:Rogiee
ID: 21847930
@exhaust ~if that were the case, i wouldn't be able to get the to website at all.  I can get to the website fine from serverA.  Server B is on the same subnet and configured the same way, however it is unable to get the the site.
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by:kadadi_v
kadadi_v earned 20 total points
ID: 21848436
Is any Internal DNS server configuration problem on server B ....:)...so its not resolvign the site URL.

Regards,

VIjay Kadadi
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by:Rogiee
ID: 21848520
I can ping the hostname fine, so not DNS.  ;o(
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by:ChiefIT
ChiefIT earned 70 total points
ID: 21850858
Go into the HOST and LMHOST files and remove anything except the loopback addresses. Those files will be looked at by your client prior to going to a DNS server or the Master browser for a DNS query or Netbios query. If they are configured without that address, you will get the types of problems you are seeing.
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Expert Comment

by:ChiefIT
ID: 21850870
Oh, Yes:
Host is located at the C:\i386\Host and can be edited with a text editor like notepad.
LMHOST can be found in two locations C:\i386\LMHOST and C:\ Windows\System32\dirvers\ect\LMHOST. That too can be edited with a text editor like notepad.
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by:exhaust
ID: 21851129
C:\Windows\System32\drivers\etc\hosts
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by:Rogiee
ID: 21851307
HOSTS and LMHOSTS are empty...


As I said before, I can ping by hostname, so the HOSTS file shouldn't matter...


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Expert Comment

by:ChiefIT
ID: 21851389
What computers do you see in My Network Places?
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by:Rogiee
ID: 21861387
I cannot see the server hosting the website in My Network Places.   I'm assuming that's because it is in the DMZ though.


I am able to ping it.  Telnet to it.  UNC to it....
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by:ChiefIT
ChiefIT earned 70 total points
ID: 21862487
This is a browser issue:

The browser uses netbios broadcasts. Netbios broadcasts will not go over a VPN tunnel, across many firewalls, or through any sort of NAT to a different subnet. Since this is the case, the browser needs help. It needs to be configured with WINS.

Here is a article on the browser service. I highly recommend anyone with browser problems read this article. This may be a NT4 article, but the browser service has not changed at all. The only thing is a registry key for 2003 server. The NT4 registry key is "IsDomainMasterBrowser". The 2003 server shortened that up to "IsDomainMaster".

Here is your fixe::: On each subnet, you will want a master browser and backup browser. Then, on the main DC, you want to make sure it has the ability to communicate as the Domain Master Browser. Master browsers on different subnets will communicate with the domain master and populate a list of nodes. In your situation, you might consider the WINS/WAN configuration of the Domain master browser.

http://www.microsoft.com/resources/documentation/windowsnt/4/server/reskit/en-us/net/chptr3.mspx?mfr=true
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Rogiee earned 0 total points
ID: 21874164
Thank you all for your help.

It ended up being the MTU setting on the server.  I changed it to 1320 and it works now!
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