Exchange 2016 CU15 tips

run updatecas.ps1 script to fix OWA and ECP
also check out this

https://social.technet.microsoft.com/Forums/windowsserver/en-US/5259018c-aec7-4490-a500-e1af54798f14/exchange-2013-ecp-error-line-43?forum=exchangesvrgeneral

1. Application Settings >> BinSearchFolders
2. Change the path with C:\Program Files\Microsoft\Exchange Server\V15\bin;C:\Program Files\Microsoft\Exchange Server\V15\bin\CmdletExtensionAgents;C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa\bin
3. Then reset IIS to check this issue.

how to put server in maintenance mode:

https://practical365.com/exchange-server/installing-cumulative-updates-on-exchange-server-2016/

https://www.enowsoftware.com/solutions-engine/exchange-2019-cu4-and-exchange-2016-cu15-explained


# start maintenance on the computer

$Computer = $ENV:ComputerName
Set-ServerComponentState $Computer -Component HubTransport -State Draining -Requester Maintenance
Redirect-Message -Server $Computer -Target

# Prevent DAG member becoming PAM
Suspend-ClusterNode $Computer

# Move all Mailbox Databases and prevent hosting copies on current server
Set-MailboxServer $Computer -DatabaseCopyActivationDisabledAndMoveNow $True
Set-MailboxServer $Computer -DatabaseCopyAutoActivationPolicy Blocked

# Put the Exchange 2013 server in Maintenance Mode:
Set-ServerComponentState $Computer -Component ServerWideOffline -State Inactive -Requester Maintenance
# verify

Get-ServerComponentState $Computer | ft Component,State –Autosize


# stop maintenance on the computer

$Computer = $ENV:ComputerName
Set-ServerComponentState $Computer -Component ServerWideOffline -State Active -Requester Maintenance
Resume-ClusterNode $Computer
Set-MailboxServer $Computer -DatabaseCopyActivationDisabledAndMoveNow $False
Set-MailboxServer $Computer -DatabaseCopyAutoActivationPolicy Unrestricted
Set-ServerComponentState $Computer -Component HubTransport -State Active -Requester MaintenanceRestart-Service MSExchangeTransport
Restart-Service MSExchangeFrontEndTransport

Get-ServerComponentState $Computer | ft Component,State –Autosize