[cvsnt] Re: Lockserver on Loopback?

Bo Berglund Bo.Berglund at system3r.se
Wed Feb 11 13:58:38 GMT 2004

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Are we talking about the same thing?
The Microsoft LoopBack Adapter is what I mean. It is not installed 
by default and if you want your laptop to retain the TCP/IP protocol 
even when you pull the plug on the network cable it is essential. 

If no network adapter is present when the LAN cable is pulled then 
Win2000 and up will unload the TCP/IP protocol and you cannot use 
any socket communication within the PC itself anymore.

So sometimes you need to have it installed (I do). But to install 
it menas going to Add/Remove Hardware and go though the guide and 
manually select the network card, then Microsoft then LoopBack Adapter.
This installs it onto the system. After this you have to give it a 
sensible IP address too, just like you do the other NICs, except 
this one will never see a DHCP server of course.

When we have this adapter enabled on our production PC:s in addition
to a real NIC on the customer's network we get these delays in 
communication that breaks our SQLServer calls. Disabling it cures those 
delay issues.

BTW, I saw mention of the loopback in the commit messages from CVSNT.


-----Original Message-----
From: cvsnt-bounces at cvsnt.org [mailto:cvsnt-bounces at cvsnt.org]On Behalf
Of Tony Hoyle
Sent: den 11 februari 2004 12:17
To: cvsnt at cvsnt.org cvsnt downloads at march-hare.com @CVSNT on Twitter CVSNT on Facebook
Subject: [cvsnt] Re: Lockserver on Loopback?

"Bo Berglund" <bo.berglund at telia.com> wrote in message 
news:qkjj20923dob76cvqvsgd4u66fhsqi7boi at 4ax.com...
> Tony,
> what happens if the loopback adapter is not installed?

Without loopback windows wouldn't be very sane.  Lockserver has always 
relied on it.  Various other apps rely on it too (SQLServer, Pageant and 
Cygwin for example).

> Disabling loopback solved that problem.

I'm not aware that you can disable it, short of firewalling it.


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