How to fix 502 error with ARR IIS

Question

How to fix 502 error with ARR IIS

KETATA Rami 376

Hello, i have a reverse proxy ARR which redirect OWA access to my Exchange 2013. i installed a new Exchange Server 2019 and it works fine. But when i change the ARR configuration to point to my Exchange 2019 instead of my Exchange 2013, i get the error 502: 502 - The Web server has received an incorrect response when used as a gateway or proxy server. The page you are looking for has a problem and cannot be displayed. When the Web server (used as a gateway or proxy) contacted the upstream content server, it received an erroneous response.

Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2024-01-19T07:21:47.7033333+00:00

@KETATA Rami You need more information to analyze your problem, try using failed request tracing to see details about 502 error, this will generate detail log file, which will help you to identify the problem.

KETATA Rami 376

@Sam Wu-MSFT Hello, Here is my logs when using failed request tracing. Any idea?

 <EventData>
  <Data Name="ContextId">{00000000-0000-0000-1516-0080000000ED}</Data>
  <Data Name="ModuleName">ApplicationRequestRouting</Data>
  <Data Name="Notification">128</Data>
  <Data Name="HttpStatus">502</Data>
  <Data Name="HttpReason">Bad Gateway</Data>
  <Data Name="HttpSubStatus">3</Data>
  <Data Name="ErrorCode">2147954430</Data>
  <Data Name="ConfigExceptionInfo"></Data>
 </EventData>

Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2024-01-22T09:16:07.97+00:00

@@KETATA Rami This is not the log content I want, you can post the complete log.

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Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2024-01-19T07:21:47.7033333+00:00

@KETATA Rami You need more information to analyze your problem, try using failed request tracing to see details about 502 error, this will generate detail log file, which will help you to identify the problem.
KETATA Rami 376 Reputation points

2024-01-19T16:03:44.49+00:00

@Sam Wu-MSFT Hello, Here is my logs when using failed request tracing. Any idea?

<EventData> <Data Name="ContextId">{00000000-0000-0000-1516-0080000000ED}</Data> <Data Name="ModuleName">ApplicationRequestRouting</Data> <Data Name="Notification">128</Data> <Data Name="HttpStatus">502</Data> <Data Name="HttpReason">Bad Gateway</Data> <Data Name="HttpSubStatus">3</Data> <Data Name="ErrorCode">2147954430</Data> <Data Name="ConfigExceptionInfo"></Data> </EventData>
Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff

2024-01-22T09:16:07.97+00:00

@@KETATA Rami This is not the log content I want, you can post the complete log.

Answer 1

A 502 Bad Gateway error typically indicates a problem between a client and a server, frequently involving a reverse proxy. If the option below is helpful, please select it.

Make sure your Exchange Server 2019 is healthy and operational.
ARR Configuration - Correct the server address, ports, and other settings.
Examine the IIS logs on your Exchange 2019 server for the requests that caused the 502 error.
TLS/SSL Protocols and Cypher Suites - Examine the TLS/SSL protocols and cipher suites configured in ARR and Exchange 2019. Maintain compatibility and consistency.
Check the application pool settings for Exchange in IIS. Make sure it's using the correct .NET version and other settings.

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How to fix 502 error with ARR IIS

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