Hi Migrating from exchange 2016 to 2019. Exchange host 2019: elemsex01 I get "HTTP Error 503. The service is unavailable" when browsing to: Hostname correct certificate: https://elemsex01.corp.elevation.se/ecp/ Local host: https://localhost/ecp/ DNS record: https://remote.corp.elevation.se/ecp/ I have read all threads and blogs I can finned but nothing is helping me. Do someone have any idea how I can continue my trouble shooting? //marsk

Forgot. Thanks for all help you giving me. Is the any possibility to reinstall the IIS part of Exchange 2019? //marsk

Hi No, it's exactly as it was before the reconstruction. I've recreated the Exchange certificate, have bound it to standard and backend sites. Exchange 2013 had a “Best Practices Analyzer” do you know if there is anything for 2019? //marsk

I also had this error after windows updates. Luckily MuhammadBilal-8946 post fixed it. Thx

"HTTP Error 503. The service is unavailable" then browsing to /ECP "exchange 2019"

Martin Skorvald 26

Hi
Migrating from exchange 2016 to 2019.

Exchange host 2019: elemsex01

I get "HTTP Error 503. The service is unavailable" when browsing to:

Hostname correct certificate: https://elemsex01.corp.elevation.se/ecp/
Local host: https://localhost/ecp/
DNS record: https://remote.corp.elevation.se/ecp/

I have read all threads and blogs I can finned but nothing is helping me.

Do someone have any idea how I can continue my trouble shooting?

//marsk

Alberto Lopez 11 Reputation points

2023-11-15T21:16:19.5+00:00

We had similar issue, this was the fix. We were also missing the Exchange Bank End certificate on port 444. Not sure if this matters, but we used our certificate first (third party) and EAC, EMS, and mail flow is working.

Thanks for post

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Martin Skorvald 26 Reputation points

2020-11-18T07:55:41.687+00:00
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Martin Skorvald 26 Reputation points

2020-11-18T08:02:50.41+00:00

Forgot.
Thanks for all help you giving me.

Is the any possibility to reinstall the IIS part of Exchange 2019?

//marsk
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Kael Yao-MSFT 37,656 Reputation points Microsoft Vendor

2020-11-18T08:53:04.293+00:00

Hi,
You are welcome and wish we can find a solution to this problem.

Can you open EMS(Exchange Management Shell) on the Exchange 2019 server?
If you can,please run the following commands to recreate ECP/OWA virtual directories.

Remove-EcpVirtualDirectory -Identity "Server01\ecp (Default Web site)" New-EcpVirtualDirectory Remove-OwaVirtualDirectory -Identity "Server01\owa (Default Web site)" New-OwaVirtualDirectory

If it doesn't help with your problem,please create a new self-signed certificate via EMS and bind it to the Exchange Back End site.

New-ExchangeCertificate

KAOT 1 Reputation point

2021-06-24T12:07:29.373+00:00

Creating and binding a new self signed backend certificate did it for us. Thank you!

Kael Yao-MSFT 37,656 Reputation points Microsoft Vendor

2021-06-25T03:20:41.603+00:00

Glad to hear it worked for you :)

Bill Garcia 1 Reputation point

2022-06-03T00:34:05.263+00:00

Did you ever solved this issue I'm having the same http error 503 only in ECP, OWA works fine.

Bill
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Martin Skorvald 26 Reputation points

2020-11-19T10:39:49.037+00:00

Hi
No, it's exactly as it was before the reconstruction.
I've recreated the Exchange certificate, have bound it to standard and backend sites.
Exchange 2013 had a “Best Practices Analyzer” do you know if there is anything for 2019?

//marsk
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Kael Yao-MSFT 37,656 Reputation points Microsoft Vendor

2020-11-20T02:18:28.93+00:00

Hi,
Please refer to this link: Exchange Analyzer
It also applies to Exchange 2019.

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PaulP 1 Reputation point

2022-12-27T06:41:29.047+00:00

I also had this error after windows updates. Luckily MuhammadBilal-8946 post fixed it.

Thx
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Boluwade Kujero 20 Reputation points

2024-07-31T09:48:18.1+00:00

could you please link me to the particular post that helped you. I am having the same issue with our exchanger servers. I suspect it is an update that broke things

Boluwade Kujero 20 Reputation points

2024-07-31T09:57:37.18+00:00

Don't bother, I found a fix to it posted by muhammad bilal here:

https://learn.microsoft.com/en-us/answers/questions/154057/http-error-503-the-service-is-unavailable-then-bro?page=1&orderby=Helpful&comment=answer-453697#newest-answer-comment
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