RE: Can't change tcp/ip registry

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Hello Dave,

Thank you for posting here.

According to your description, I understand that the keys
enablepmtudiscovery and tcpmaxdataretransmissions values will be reset
when reboot after you manually change them. If I have misunderstood the
problem, please don't hesitate to let me know.

Based on my research, I suggest we try the following steps to see if we can
resolve this issue:

This is a strange issue. As I know, the ISA server 2006 will not change the
keys values. I think there is 3rd-party software or driver did it. I
suggest you perform clean boot to narrow down this issue:

To clean boot the problematic computer, please use the steps below:
a. Click Start, click Run, and then in the Open box, type "MSCONFIG"
(without the quotation marks). Click OK.

b. In the System Configuration Utility (MSConfig) window, click to select
the Selective Startup button.

c. Click to clear the check mark from the "Load startup items" below
Selective Startup.

d. Click the Services tab, click to check the "Hide All Microsoft Services"
box, and remove all the check marks from the remaining Non-Microsoft
Services.

e. Click OK to close the MSConfig window. Click Yes when you are asked to
restart your computer in order to enable the changes.

f. After restarting, please check whether this issue will reoccur.

g. If there are no more problems, please use the above steps to enable
services and startup items one by one in order to figure out the root cause
of this issue.

If clean boot unable to isolate the issue, I suggest you boot your server
to safe mode to see if it reoccur.

Additional, you can refer to the following KB. That why ISA BPA suggest you
change the value to '1':
You may experience a long delay when you try to use Internet Explorer to
access a redirected Web page and Internet Explorer uses ISA Server 2004 as
a Web proxy server
http://support.microsoft.com/kb/905179

What's the enablepmtudiscovery:
http://msdn2.microsoft.com/en-us/library/ms883400.aspx

http://www.microsoft.com/china/technet/security/guidance/secmod150.mspx

The tcpmaxdataretransmissions usage:

This parameter controls the number of times TCP will retransmit an
individual data segment (non connect segment) before aborting the
connection. The retransmission timeout is doubled with each successive
retransmission on a connection. It is reset when responses resume. The base
timeout value is dynamically determined by the measured round-trip time on
the connection.

I hope these steps will give you some help.

Thanks and have a nice day!

Sincerely,

Terence Liu (MSFT)

Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
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Thread-Topic: Can't change tcp/ip registry
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From: =?Utf-8?B?RGF2ZQ==?= <davep@xxxxxxxxxxxxxxxx>
Subject: Can't change tcp/ip registry
Date: Wed, 11 Jun 2008 07:53:01 -0700
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When I run the BPA is says I should change the tcp/ip registry value
enablepmtudiscovery to 1. But something (ISA 2006?) changes the setting
back
to 0. I deleted the value and at boot up it comes back with a value of 0.

Is there some additional steps needed - I haven't seen this discussed
anywhere.

I was also wondering about the value tcpmaxdataretransmissions, it is set
to
3 but it seems the default should be 5 but again something is reseting the
value after I change it.

Help!

Windows 2003 SE R2 SP2
ISA 2006 SE
Websense 6.3

TIA
Dave


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