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We are using load balancing and have three servers for that. On one of the servers the machine.config file had different machine key then the other two machines. Once we updated the machine key and made the value same as the other two, now we can't run the website through that server. What do you guys think can be the reason? Thanks, Laziale

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"now we can't run the website through that server" - any error messages? error codes? please describe the behavior you expect and the behavior you are observing after the change – Mathias R. Jessen Jul 26 '12 at 12:42
@MathiasR.Jesson I am getting this error message Service Unavailable HTTP Error 503. The service is unavailable. I can call the website from the other two servers normally. No error code – Laziale Jul 26 '12 at 13:20
up vote 1 down vote accepted

HTTP 503 usually indicates that the Application Pool is unavailable for request processing.

  1. Make sure the Application Pool is running
  2. Enable Detailed Errors - but only for local requests, and then browse the web app from the server itself
  3. If that doesn't yield any results, enable Failed Request Tracing, browse the site again, and review the Failed request reports
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Application Pool was stopped for some reason. Thanks – Laziale Jul 26 '12 at 14:11

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