Get-ChildItem IIS:\AppPools | where {$_.state -eq "Stopped"} | Start-WebAppPool
Start-Service WAS (windows process activation service)
Start-Service W3SVC
application pool和was 停止的原因是，使用web platform installer安装url rewrite。安装失败之后导致的，
=== Verbose logging started: 3/6/2019 14:35:58 Build type: SHIP UNICODE 5.00.10011.00 Calling process: C:\Program Files\Microsoft\Web Platform Installer\WebPlatformInstaller.exe ===
MSI (c) (6C:D0) [14:35:58:019]: Resetting cached policy values
MSI (c) (6C:D0) [14:35:58:019]: Machine policy value ‘Debug‘ is 0
MSI (c) (6C:D0) [14:35:58:019]: ******* RunEngine:
******* Product: C:\Users\clu\AppData\Local\Microsoft\Web Platform Installer\installers\UrlRewrite2\8F41A67FA49110155969DCCFF265B8623A66448F\rewrite_amd64_en-US.msi
******* Action:
******* CommandLine: **********
MSI (c) (6C:D0) [14:35:58:019]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (6C:D0) [14:35:58:019]: Grabbed execution mutex.
MSI (c) (6C:D0) [14:35:58:022]: Cloaking enabled.
MSI (c) (6C:D0) [14:35:58:022]: Attempting to enable all disabled privileges before calling Install on Server
MSI (c) (6C:D0) [14:35:58:026]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (C4:E0) [14:35:58:033]: Running installation inside multi-package transaction C:\Users\clu\AppData\Local\Microsoft\Web Platform Installer\installers\UrlRewrite2\8F41A67FA49110155969DCCFF265B8623A66448F\rewrite_amd64_en-US.msi
MSI (s) (C4:E0) [14:35:58:033]: Grabbed execution mutex.
MSI (s) (C4:18) [14:35:58:038]: MainEngineThread is returning 1603
MSI (s) (C4:E0) [14:35:58:039]: User policy value ‘DisableRollback‘ is 0
MSI (s) (C4:E0) [14:35:58:039]: Machine policy value ‘DisableRollback‘ is 0
MSI (s) (C4:E0) [14:35:58:039]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (C4:E0) [14:35:58:039]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (C4:E0) [14:35:58:041]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (C4:E0) [14:35:58:042]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (6C:D0) [14:35:58:044]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (6C:D0) [14:35:58:044]: MainEngineThread is returning 1603
=== Verbose logging stopped: 3/6/2019 14:35:58 ===
原文：https://www.cnblogs.com/chucklu/p/10483059.html