EdgeTransport crashes with Event ID 1000 (exception code 0xc00000fd) in Exchange Server 2019 and 2016

Symptoms

In Microsoft Exchange Server 2019 or Exchange Server 2016, EdgeTransport.exe crashes because of a stack overflow exception. You may see this event in the application logs:


Log Name:      Application

Source:        Application Error

Date:          DateTime

Event ID:      1000

Task Category: (100)

Level:         Error

Keywords:      Classic

User:          N/A

Computer:      ComputerName

Description:

Faulting application name: edgetransport.exe, version: 15.1.1847.3, time stamp: 0x5d5c6650

Faulting module name: clr.dll, version: 4.7.3062.0, time stamp: 0x5ab9567c

Exception code: 0xc00000fd

Fault offset: 0x0000000000004fb4

Faulting process id: 0xfc

Faulting application start time: 0x01d59a7080bdc2fd

Faulting application path: C:\Program Files\Microsoft\Exchange Server\V15\Bin\edgetransport.exe

Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll

Report Id: ReportID

Faulting package full name:

Faulting package-relative application ID:

Cause

This issue occurs because the error "451 4.7.0 Temporary server error. Please try again later. PRX5" is populated in the smtp.target response variable. It causes the stack for filling the InboundProxyLayer's buffer keeps building up.

Resolution

To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 7 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​
For Exchange Server 2016, install the Cumulative Update 18 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

More information

Learn about the  terminology that Microsoft uses to describe software updates.

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