Mdbc failing to connect to mongoDb Atlas with DnsClient error

[pawan-regoti]

I have a powershell script using Mdbc to connect to mongodb atlas but suddenly it started failing with dns client error. I saw something similar before 2 weeks ago with Mongo C# driver. But updating MongoDb C# driver and adding DnsClient package seems to fix the issue in my vs project.

But i am unable to make it work in powershell as my system already has DnsClient version 1.0.0.0 powershell module (which looks like latest version).

Do you have a workaround for this?

[nightroman]

Can you try a hack, copy the latest DnsClient (1.3.1 or 1.3.0) to the Mdbc installation directory and see if it works? (Mdbc package currently uses 1.2.0, as I can see).

[nightroman]

Here they say the latest version of DnsClient should fix some known MongoDB C# driver issues.

[nightroman]

How is it going?

[pawan-regoti]

Hi @nightroman ,
Currently I am using powershell so It uses powershell version of Mdbc, so I am not sure if I can directly inject DnsClient 1.3.1 nuget package there.
Microsoft Powershell has embedded DnsClient right of the box and it looks like it is on latest version (1.0.0.0)
https://docs.microsoft.com/en-us/powershell/module/dnsclient/?view=win10-ps

Do you have any suggestions regarding this?

[nightroman]

(1) Get the package

nuget install DnsClient

or use other methods (download) and unzip.

(2) Go to one of

DnsClient.1.3.1\lib\net45
DnsClient.1.3.1\lib\netstandard2.0

depending on your Mdbc package (PSGallery is netstandard2.0, NuGet is net45).

(3) get DnsClient.dll there and copy to your Mdbc module location, see

(get-module mdbc -ListAvailable).Path

You should replace the existing DnsClient.dll with the newer one.

Then try your problem case again and let me know the result.

[pawan-regoti]

Just replacing DnsClient.dll will not cut it as Mdbc.dll is referencing DnsClient version 1.2.0.0
Either Mdbc.dll needs to be updated (which is a bad idea) or a new version of the Mdbc package (which references DnsClient 1.3.1)will fix it.

[pawan-regoti]

So, just for kicks I tried your suggestion :) , and it gave the same error that I initially theorized

[nightroman]

and it gave the same error that I initially theorized

It is a different error.

OK, the problem is that not Mdbc is referencing DnsClient but C# driver. We need the driver that references the newer DnsClient. Mdbc cannot help, unfortunately, Try to open the issue there.

All in all, I am about to close the issue. It is not really related to Mdbc.

[pawan-regoti]

Latest version of MongoDB.Driver.Core has updated the dependency to DnsClient 1.3.1
https://www.nuget.org/packages/MongoDB.Driver.Core/

MongoDB.Driver.Core 2.10.2 -> DnsClient 1.2.0
MongoDB.Driver.Core 2.10.3 -> DnsClient 1.3.1

So, Updating MongoDB.Driver to 2.10.3 will fix this issue.

[nightroman]

Aha, it is the good news. Then give me some short time and I will update Mdbc as well.

[nightroman]

v6.5.5 Done. Thank you for reporting and helping to fix this (hopefully).