In several instances that I came across ... as a result of M $ updates, it sometimes does something internal for Internet user accounts such as
IWAM_ {computer_name} IUSR_ {computer_name}
which are sometimes used by IIS as a website account. It was as simple as clearing and resetting the password for these accounts, and the site was active again without any problems (until some subsequent update related to IIS started the account again).
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