A timeout occured after 30000ms selecting a server using CompositeServerSelector

Question

I try to deploy my Mongo database in Mongolabs, everything works fine, and I create a new database. Please see my connectionstring.

    public DbHelper()
            


        

Answer 1

Same Error Message but not encountered with a MongoLabs deployment.

I just encountered the same error listed in the title with an Asp.Net Core App. My issue was due to an IOC configuration issue.

In my IOC container, my wrapped MongoClient instance was configured with a dependency transient lifestyle.

Per The MongoDb C# Driver:

It is recommended to store a MongoClient instance in a global place, either as a static variable or in an IoC container with a singleton lifetime.

I promoted the lifestyle of my object to a singleton and it resolved the issue.

I am using:

• .Net Core 2.0
• Mongo C# Driver version 2.5
• Castle Windsor for my IOC version 3.3.0

Please reference the C# Driver Client section: http://mongodb.github.io/mongo-csharp-driver/2.5/reference/driver/connecting/#re-use