Client Certs behind a Load Balancer
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Client Certs behind a Load Balancer         


Author: Ryan Hanisco
Date: Jul 18, 2008 12:55

Everyone,

I have a client that has a wildcard cert on a load balancer in front of a
server farm. One of the webs that is hosted on this farm uses Client Certs
for authentication. Unfortunately, the issue arises that the load balancer
(F5) decrypts SSL handing only port 80 to the back-end web servers. Under
this configuration, the client certs are never checked as the inbound traffic
is HTTP only. Now we can use the internal CAs to issue the server certs and
pass the HTTPS all the way to the IIS instance... but then this has the
problem of causing the unauthorized cert warning to be displayed.

Further, this is posing a particular issue when obtaining the user cert as
Vista clients will not accept a cert unless the decrypt is happening in IIS
and has no way of detecting that the connection is secure, but through the
load balancer.

I am looking for some kind of direction here of how to do this correctly
while still using the wildcard that is supporting the farm.
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1 Comment
Re: Client Certs behind a Load Balancer         


Author: David Wang
Date: Jul 18, 2008 18:45

On Jul 18, 12:55 pm, Ryan Hanisco
discussions.microsoft.com> wrote:
> Everyone,
>
> I have a client that has a wildcard cert on a load balancer in front of a
> server farm.  One of the webs that is hosted on this farm uses Client Certs
> for authentication.  Unfortunately, the issue arises that the load balancer
> (F5) decrypts SSL handing only port 80 to the back-end web servers.  Under
> this configuration, the client certs are never checked as the inbound traffic
> is HTTP only.  Now we can use the internal CAs to issue the server certs and
> pass the HTTPS all the way to the IIS instance...  but then this has the
> problem of causing the unauthorized cert warning to be displayed.
>
> Further, this is posing a particular issue when obtaining the user cert as
> Vista clients will not accept a cert unless the decrypt is happening in IIS
> and has no way of detecting that the connection is secure, but through the
> load balancer.
>
> I am looking for some kind of direction here of how to do this correctly
> while still using the wildcard that is supporting the farm. ...
Show full article (2.49Kb)
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