http 503 error in Exchange Server 2019

Md. Al Amin 0 Reputation points

I have Exchange Server 2019 Version 15.2 ‎(Build 221.12)‎, Recently I installed another Exchange server 2019 Version 15.2 ‎(Build 1118.7)‎ in my environment. but I can't log in to ECP / OWA from the new Exchange Server.

Kaniz ex02

Exchange Server
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A family of Microsoft client/server messaging and collaboration software.
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Microsoft Exchange Online Management
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Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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2 answers

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  1. Jame Xu-MSFT 4,171 Reputation points

    Hi @Md. Al Amin ,

    You could check the following things:

    1.check the certificates bindings of Default Web Site and Exchange Back End in IIS manager.

    2.check if the MSExchangeECPapppool stops or recycle the MSExchangeECPapppool.

    3.check if there is any error message in the application log.

    Here is a similar case that you could refer to: "HTTP Error 503. The service is unavailable" then browsing to /ECP "exchange 2019"

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  2. Amit Singh 4,861 Reputation points

    Have you read through the Exchange Server Troubleshooting documentation, specifically the Client Connectivity section, even more specifically the checklists and procedures in OWA or ECP stops working after you install a security update

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