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i tryed to use ITextSharper yesterday today i started my server got HTTP ERROR 503 , after trying to deploy i find out that my application pool get stopped when i try to go to my site in internet explorer , i have tried to reset the application pool but still got same problem.

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Make sure that the password has not changed or expired for the Application Pool service account.

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If password of Application Pool account is not expired, check this question.

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