Failed to Open IIS MMC after modified machine.config


To test a customer performance issue, I modified the processModel configuration in machine.config. After that, I opened IIS MMC and got follow error when try to expand the sites.

“There was an error when trying to connect. Do you want to retype your credentials and try again?


The data is invalid. (Exception from HRESULT: 0x8007000d”

My first action is open event viewer to see if there anything helpful in event logs. Unfortunately, I got follow error when try to open event viewer.

“MMC cannot initialize the snap-in”

Now, I suspect the problem related to what I changed in machine.config. After review my changes carefully, I noticed that I made a stupid error.

Here is the content I added in machine.config, the closing mark was not complete!

<processModel maxWorkerThreads="100" maxIoThreads="100" minWorkerThreads="50">

Here is the correct one:

 <processModel maxWorkerThreads="100" maxIoThreads="100" minWorkerThreads="50" />


Best Regards,


Zhao Wei


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