RE: Error Code 64: Host not available

Dear Crina,

Thanks for your detailed response to my question. I have tried to implement
the steps you outlined, and this did not solve my problem. I tried to
eliminate SBS as an issue and connected a pc directly to the router on the
ISP connection. I am still umable to connect to this website. I am
contacting the ISP to solve the problem.

Thanks,
Duncan Pope

""Crina Li"" wrote:

Hi Duncan,

Thank you for posting in SBS newsgroup.

From the description, I understand the issue to be: you can not access a
particular web site from SBS 2003 network. If I have misunderstood your
concerns, please do not hesitate to let me know.

As I know, you can try to turn off EDNS0 functionality on the SBS 2003
server. To do so, at the command prompt, type:

"dnscmd <SBS 2003 Server Name>/Config /EnableEDnsProbes 0" (without the
quotation marks), and press Enter.

Then check again to see if the issue is resolved.

For more information, please refer to this KB article:

828731 An External DNS Query May Cause an Error Message in Windows Server
2003
http://support.microsoft.com/?id=828731

828263 DNS query responses do not travel through a firewall in Windows
Server 2003
http://support.microsoft.com/default.aspx?scid=kb;EN-US;828263

Also please check the network configuration on SBS network:

For 2 NICs on SBS:

On SBS server:

External NIC:
IP: assigned by your ISP or your hardware router
Gateway: your ISP or your Hardware router IP
DNS: SBS INTERNAL NIC IP as the only entry

Internal NIC:
IP: Fixed IP
Gateway: None
DNS: SBS INTERNAL NIC IP as the only entry

In the DNS console (dnsmgmt.msc), right click your ServerName and click
properties. In the Forwarders tab, your ISP DNS server IP should be
inputted there.

On workstation inside your SBS local subnet

IP: Assigned by DHCP on SBS
Gateway: SBS internal NIC IP
DNS: SBS INTERNAL NIC IP as the only entry

If the problem still occurs, in order to narrow down the problem, please
help me collect the following information:

1. Does the situation only occur on one website?
2. Do you access the web site from SBS or internal clients?

Relate information:

How to configure networks in ISA Server 2004
http://support.microsoft.com/?id=867483

What's New and Improved in ISA Server 2004
http://www.microsoft.com/isaserver/evaluation/whatsnew.asp

ISA Server 2004 Performance Best Practices
http://www.microsoft.com/technet/prodtechnol/isa/2004/performancebestpractic
es.mspx

ISA Server 2004 ISA Server 2004 Configuration Guide
http://download.microsoft.com/download/3/7/b/37b0cbc4-e578-4082-a779-de4fbe8
76f06/ISA2004SE_configguide-Rev%201%2003.doc

I appreciate your time and look forward to hearing from you.

Best regards,

Crina Li (MSFT)

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

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--------------------
| Thread-Topic: Error Code 64: Host not available
| thread-index: Acbc8tmrVB9Wp+LUQiij6r3yArOImQ==
| X-WBNR-Posting-Host: 192.139.123.138
| From: =?Utf-8?B?RHVuY2Fu?= <Duncan@xxxxxxxxxxxxxxxxxxxxxxxxx>
| Subject: Error Code 64: Host not available
| Date: Wed, 20 Sep 2006 13:25:01 -0700
| Lines: 70
| Message-ID: <0483E6AF-BAC7-4136-ACD0-63DA3257C010@xxxxxxxxxxxxx>
| MIME-Version: 1.0
| Content-Type: text/plain;
| charset="Utf-8"
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| Content-Class: urn:content-classes:message
| Importance: normal
| Priority: normal
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.1830
| Newsgroups: microsoft.public.windows.server.sbs
| Path: TK2MSFTNGXA01.phx.gbl
| Xref: TK2MSFTNGXA01.phx.gbl microsoft.public.windows.server.sbs:299012
| NNTP-Posting-Host: TK2MSFTNGXA01.phx.gbl 10.40.2.250
| X-Tomcat-NG: microsoft.public.windows.server.sbs
|
| I have SBS 2003 Premium running on a Dell poweredge 1600 sc. Fully
patched
| with all current service packs and ISA 2004 running. I have a user
trying to
| access the following URL; http://www.corporationscanada.ic.gc.ca/ which
is
| accessable from outside our LAN, (i.e. from a direct connection to the
| gateway router).
|
| When anyone (including admin accounts) try to access this site, the
| following error occurs;
|
| Network Access Message: The page cannot be displayed
|
| Explanation: The request timed out before the page could be retrieved.
|
| Try the following:
| Refresh page: Search for the page again by clicking the Refresh button.
The
| timeout may have occurred due to Internet congestion.
| Check spelling: Check that you typed the Web page address correctly. The
| address may have been mistyped.
| Access from a link: If there is a link to the page you are looking for,
try
| accessing the page from that link.
| Contact website: You may want to contact the website administrator to
make
| sure the Web page still exists. You can do this by using the e-mail
address
| or phone number listed on the website home page.
| If you are still unable to view the requested page, try contacting your
| administrator or Helpdesk.
|
| Technical Information (for support personnel)
| Error Code 64: Host not available
| Background: The gateway or proxy server lost connection to the Web
server.
| Date: 9/20/2006 7:58:02 PM
| Server: hgi-serv1.HeadzGamez.local
| Source: Remote server
|
| I have checked ISA monitoring and it shows 'failed connection attempt'
'SBS
| outbound access rule'.
|
| I don't understand this as this is the default SBS rule and it has
'allow'
| set for all http outbound access.
|
| I Googled it and found this page
| http://www.experts-exchange.com/Security/Firewalls/Q_21483635.html
|
| for those who can't access this the relevant response refers to a reg
hack
|
| Accepted Answer from shudman
| Date: 07/27/2005 02:19PM PDT
| Grade: A
| Accepted Answer
|
|
| I was pulling my hair out with this too. I resolved mine by setting
|
|
HKLM\System\CurrentControlSet\Services\TCPIP\Parameters\EnablePMTUDiscovery
| to 1 and then rebooting.
|
| ISA changes the registry entry for EnablePMTUDiscovery to 0 on W2K3, for
| greater hardening of the TCPIP stack. When this is set to zero, it sets
ISAs
| MTU 576 instead of negotiating.
|
|
| My system already had this set to 1. I have tried to change the IE http:
| 1.1 settings re: 'Use http 1.1 and 'use http 1.1 through proxy' and this
| didn't help either.
|
| Does anyone have any idea how to figure this out?
|
| Thanks.
|
| Duncan
|
|


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