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Bring back offline CosmosDB region

Dominik Przychodni 20 Reputation points Microsoft Employee
2026-03-31T12:38:17.1733333+00:00

I have marked a region in my CosmosDB as offline per the instructions to perform a forced failover. I would like that region to be now brought online.

"For a disaster recovery drill where a region is taken offline, please create a support ticket request to bring the region back online."

I have tried to create a support ticket but I am brought here instead..

Azure Cosmos DB
Azure Cosmos DB

An Azure NoSQL database service for app development.

Answer accepted by question author
  1. Manoj Kumar Boyini 11,440 Reputation points Microsoft External Staff Moderator
    2026-04-06T22:53:18.1833333+00:00

    Hi @Dominik Przychodni

    After taking a Cosmos DB region offline for a forced failover or DR drill, bringing the region back online is supported from the side, but it is not available via the Azure portal or standard Cosmos DB CLI commands.

    As documented, the region must be brought back online using the Azure Cosmos DB Resource Provider REST API (onlineRegion operation). This is the expected and supported method.

    If the REST API call fails or the region does not transition back to Online, then please let us know and we will address it as soon as possible.

    Reference:
    https://dotnet.territoriali.olinfo.it/en-us/azure/cosmos-db/how-to-manage-database-account#perform-forced-failover-for-your-azure-cosmos-db-account
    https://dotnet.territoriali.olinfo.it/en-us/rest/api/cosmos-db-resource-provider/database-accounts/online-region?view=rest-cosmos-db-resource-provider-2025-10-15&tabs=HTTP

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