Archive for the ‘iis’ Category

follow me on Twitter

January 12, 2010

I have finally given in and put my stuff on Twitter. The stuff there will mostly be more tech in nature.

IIS – which app pool is which?

January 5, 2010

With IIS creating w3wp.exe’s for all of your apps (for which you have created a non default app pool) it is nice, but it’s impossible to tell exactly which is which. Microsoft includes a handy tool to do this with it’s in: %systemroot%system32iisapp.vbs (You may need to run it with cscript.exe if that’s not your default for .vbs).

Sample output:

C:WINDOWSsystem32>iisapp
W3WP.exe PID: 2028   AppPoolId: DefaultAppPool
W3WP.exe PID: 20224   AppPoolId: Autotransactiondocs
W3WP.exe PID: 17480   AppPoolId: IRAppPool

C:WINDOWSsystem32>

Oh, this is for Windows Server 2003 (and r2) only.. does not work with 2008 variants.

.net coding advice = do not enable debug in production!

January 5, 2010

This seems like a simple thing, really, but every single place I have worked that developed .net code has had this problem, and for some reason, devs don’t seem to get it. (It has been an uphill battle everywhere I have found it with resistance from devs. Why??)

Usually the symptoms start out with scaling issues in production, you’ll see things like threads running out, connections not being closed, and general poor application performance. You can track these down and eventually you will find that in the web.config the setting “debug=enabled” is in there. It is this way because it is the default when you create a .net application. YOU DO NOT LEAVE IT LIKE THIS IN PRODUCTION. When you do, bad things happen, such as timeouts all being set to infinite. Here’s an article with a complete list and some more info.

Depending on whether or not your organization pushes the .configs with the applications (this is a religious discussion in itself.. I recommend not pushing the configs with every build for reasons like this), then when you do your next code push, the process repeats because of this value being set improperly again.  The way to fix this for good is that in the production environment, you make a change to the machine.config to enable “retail” mode, which disallows debug from being enabled, regardless of what is in the application’s web.config.

<configuration>

<system.web>

<deployment retail=”true”/>

</system.web>

</configuration>

In my opinion, setting this in the machine.config should be part of the default build/installation/configuration of any production webserver.

detecting database connection issues (not closing) in .net

December 17, 2009

This one is really easy, but I am surprised at the number of people who are unable to troubleshoot it. If you think you are having sql connections not being closed properly, just open up perfmon, go to “.net data provider for sqlserver”, and add “numberofreclaimedconnections”. Basically what this counter shows is the number of connections that were not closed by the application, but were closed by the .net garbage collection process. Microsoft’s explanation is on this page. The same counter works for the oracle client as well (except it’s called “oracle” and not “sql”).

The symptoms of this would be a whole lot of idle connections to sql (or oracle) from the webserver, or errors about not being able to obtain a connection, running out of connections in the pool, etc. You can also see lots of connections in the time_wait status if you run a netstat –an.

this is just dumb

October 27, 2009

I had to install the SMTP service on a 2008 server today for the first time, and Microsoft does not make it easy.

  1. The SMTP install is under features and not under roles.
  2. When you do install SMTP, where do you manage it, you wonder. Thanks to google and this link, I now know that you have to use the IIS6 manager. What??!!

iis web farm deployment tool

September 30, 2009

I haven’t used this one yet but it looks pretty neat. It’s a real release of Microsoft’s IIS web farm deployment tool. Basically it replaces a lot of what I used to use MS application center for and what I do today with batch files and robocopy.

ssl diagnostics for iis7

September 30, 2009

I have spent the better part of the day trying to figure out why a client cert that’s send to our servers just plain out doesn’t work. We get a 403.17 when we shouldn’t. It’s maddening because all we can get out of IIS is the 403.17, and since we do not own the client cert, there’s no easy way for us to test. So we have to trust that our b2b partner has things set up right (we don’t think they do) and then wait 30-35 minutes in between requests for them to re-test. It’s maddening.

This post contains some good troubleshooting info and steps.

Here is a link to some info and a utility for mapping client certs, something that Microsoft inexplicably left out of IIS7. (Why?!)

Another tool I found during this whole process was the IIS7 ssl checker utility. It didn’t (hasn’t) helped our specific situation, but it is something that looks useful that I will save for future problems that will definitely come up.