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Performance Problems with Probing

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This message was discovered on microsoft.public.dotnet.framework.performance.

Jediah L.

1. In our application which uses NTLM; .Net always requests a file as
Anonymous before requesting it using the NTLM authenticated credentials - in
an application with over a million hits a day - this is quite a bit of extra
posting going on. Anyone know how to stop this?

2. Even when supplying a probing hint in the web.config file; our .Net Win
Form embeded user controls probe 6 times before finding the file (the first
4 are variations of the file with .dll, and .exe names in /bin and /root
folders, the last 2 are ANON then NTLM requests for the correct file).

So for each of the 3000+ users - for each file requested - there is
approximatly 6 web requests handled on the server - this causes slowless in
the client application - and causes additional work for the servers.

3. Just recently all of our Smart Downloads have stopped working. I have
put a sniffer on the machines - and checked the IIS logs - the CLR has
stopped doing conditional gets (No If-Modified-Since headers) and IIS (of
course) is always responding by sending a 200 (after the initial 6 probes)
and resending the files each time - instead of responding w/ the 304's and
allowing the .Net download cache to do its work.

I've already went through a long list of trying things - however - i'm
running out of ideas - i'd appreciate any thoughts!!!

Thanks!

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Jerry Pisk

1. You can't. NTLM (and pretty much every authentication scheme except
basic) requires at least two requests.

2. and 3. - Don't know...

Jerry

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Jediah L.

In re #1:

Don't really understand why though - its a poor setup - and should be
configurable.

If you know NTLM was used for the first request - why not automatically use
it for the second request - and if its used for the first half a million
requests - why not use it for the next half a million.

Or why couldn't you tell the IE configuration [This site is always NTLM].

Seems like a waste in performance and bandwidth.

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Jerry Pisk

IE does send two requests as well. And if you kept the connection open you
could reuse it without having to send two requests all the time, so - you're
right, you have a poor setup in your application. You should have a
connection pool that you'll use for your requests, instead of opening and
closing a connection each time.

Jerry

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Jediah L.

So you would suggest a better setup is to open a single HTTP connection and
keep it open for the 10 hour working day?

I wonder why IE doesn't do the same thing if it is such a great way to do
it? (In our application, we both use IE - with embeded Win Form User
Controls - and we use .Net Win Form .Exe's both exhibit the same problem).

But seriously - I appreciate your response - and didn't really expect you or
anyone else to have an answer to #1 - its a flaw imo in the way microsoft
has implemented their authentication scheme.

Any thoughts on #2 and #3 would also be greatly appreciated!

Thanks!

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Jerry Pisk

That's exactly what I suggest. It's not a flaw, it's just the way all secure
authentication schemes work (so don't blame Microsoft, it's not just NTLM).

Sorry I can't help you with the rest.

Jerry

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Jediah L.

By the way, thought I'd pass this along, if anyone is ever looking &
intrested.

There was a way to do #1 - surprisingly - using the
UnsafeAuthenticatedConnectionSharing property of the Web Request object.

I have some outstanding questions about the stability and any performance
implications - however - it does exactly what I was looking for.

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