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woelki's avatar
woelki
Iron Contributor
Nov 17, 2025
Solved

Hybrid Update Agent download fails

Hi there,

last Friday I was successfully able to execute the HCW with the full classic deployment. As we had some sharing issues we tried the full modern as well. But we were able to execute the HCW and finish it all the time.

This morning there was an update for the HCW and suddenly we had issues with the part Hybrid Update Agent download which always mentions "Content Not Found"

We tried this several times throughout the day, but unfortunately the error is still the same.

Is there a general issue with the location of the HybridAgent file since the HCW has been updated?

Kind regards

exchange online
hybrid
office 365

19 Replies

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  • woelki's avatar
    woelki
    Iron Contributor
    Nov 18, 2025

    I wanted to make this topic a bit more visible so I collected some information.

    Problem Description

    • Error: 504 Gateway Timeout during the Hybrid Agent download step (MSHybridService.msi).
    • Affected HCW Version: 17.1.3891.0 (Updated over the weekend).
    • Affected Exchange Version: Exchange Server 2016 CU23 and 2019 CU15

     

    Technical Details & Diagnosis Performed

    The error is reported in the log as follows:

    *ERROR* [...] System.Net.Http.HttpRequestException: Der Antwortstatuscode gibt keinen Erfolg an: 504 (Gateway Timeout).
*ERROR* [...] Unable to ping Highlands service

     

    What we have ruled out (Tests confirmed successful):

    1. Network/Proxy: The error occurs in both the corporate network and private test environments.
    2. TLS/Crypto: TLS 1.2 registry entries are correctly configured and utilized by the .NET Framework.
    3. Target Reachability: A direct .NET PowerShell test from the server to the download URL returns Status 200 (OK):
    Invoke-WebRequest -Uri "https://hybridconfigwizard.azurewebsites.net/MSHybridService.msi" -Method Head
# -> Result: Status 200

     

  • DraFi30's avatar
    DraFi30
    Copper Contributor
    Nov 18, 2025

    Same here. Trying to go through the HCW and it stops at the Updater Agent.

  • Jowi's avatar
    Jowi
    Copper Contributor
    Nov 18, 2025

    Same problem here. The download: https://hybridconfiguration.blob.core.windows.net/connector/MSHybridAutoUpdater.msi

    Gives the error

    <Error>

    <Code>PublicAccessNotPermitted</Code>

    <Message>Public access is not permitted on this storage account. RequestId:2d2361ca-501e-0000-762b-58f612000000 Time:2025-11-18T01:31:51.3181591Z</Message>

    </Error>

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