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

Question

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

Answer 1

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

Thx

Answer 2

Hi Martin,

I ran into similar issue when we installed a windows update. the errors were as below.

1. users would get the error "Fix Exchange HTTP Error 503. The Service is Unavailable" when trying to access email via OWA
2. Outlook Clients wont connect to the exchange server

****Resolution:****

1. Open “ISS Manager”, Type “inetmgr” in “RUN” and select Default Web Settings and Open “Edit Binding option”It is vital to provide the correct Exchange Certificates to the ports
2. as there are two parts of IIS in exchange 2013 onwards i.e. Exchange Frontend and Exchange Backend
3. first I verified that the SSL corticates bindings with the correct SSL certificate were present.
4. Than I looked at the Exchange Bank End home and found that there were no certificate bindings for port 444
5. Selected the Microsoft Exchange Server ( self generated default Certificate by the exchange Server) do not use the third party CA to bind in this location
6. as soon as this was selected OWA/ECP and outlook clients started working fine.

I hope this helps.

Many Thanks

Bilal

Answer 3

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

Answer 4

Forgot.
Thanks for all help you giving me.

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

//marsk

Answer 5