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C# TMDbClient HttpRequestException: An error occurred while sending the request

I'm using the TMDbLib https://www.nuget.org/packages/TMDbLib/ 1.9.2 (upgraded due to error bellow) to grab info about TV shows. Until a day or so ago, this has been working.
Some aspects are still working. I've checked my API Key, and that is valid.
I'm getting the following errors
// Access to The Movie DB API
TMDbClient client = new TMDbClient(<API KEY>);
Error: but no exception
'client.Config' threw an exception of type 'System.InvalidOperationException'
Then
var NewEpisode = client.GetTvEpisodeAsync(TMDBid, SeasonNumber, Epnum).Result;
Error: with exceptions
This exception was originally thrown at this call stack:
[External Code]
Inner Exception 1:
HttpRequestException: An error occurred while sending the request.
Inner Exception 2:
WebException: The underlying connection was closed: An unexpected error occurred on a receive.
Inner Exception 3:
IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
Inner Exception 4:
SocketException: An existing connection was forcibly closed by the remote host
Are these related, and how might I fix this? BTW I have Fast internet.

I think I've fixed this
Putting here in case someone else has similar issues
themoviedb.org uses TLS 1.3
Turns out I was using an older version of .NET framework that doesn't support TLS 1.3
Ref:
https://learn.microsoft.com/en-us/dotnet/framework/network-programming/tls
and
The request was aborted could not create SSL/TLS secure channel - HttpWebRequest
Uninstalled TMDBLib and System.Net.Http
Updated to newer .Net Framework
Reinstalled TMDBLib, System.Net.Http is a dependency so gets installed by default

Kofax server throws error "VRS failed with error -136"

Kofax server throws error "VRS failed with error -136" when a job is submitted with index fields and works fine when job is submitted without index fields. I suspect some configuration issue on the kofax server setup but unable find which configuration is causing it throw error -136

'System.AggregateException' when attempting to connect to my Common Data Service web api

Here is my code:
string url = "https://myOrg.api.crm.dynamics.com";
string apiVersion = "9.1";
string webApiUrl = $"{url}/api/data/v{apiVersion}/";
var authParameters = AuthenticationParameters.CreateFromResourceUrlAsync(new Uri(webApiUrl)).Result;
My last line of code is failing with:
The ouput is:
MyAPITest.vshost.exe Error: 0 : 11/05/2019 19:20:17: - AuthenticationParameters: System.ArgumentException: Unauthorized Http Status Code (401) was expected in the response
Parameter name: response
Exception thrown: 'System.AggregateException' in mscorlib.dll
The program '[5556] MyAPITest.vshost.exe' has exited with code -1 (0xffffffff).
For reference, I am attempting to use the Quick Start Guide to connect to the Common Data Service.
EDIT:
In looking at the details I am seeing:
Error
The underlying connection was closed: An unexpected error occured on a send.
More detail beneath that error:
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

AuthenticationParameters: System.ArgumentException: Unauthorized Http Status Code (401) was expected in the response
The error is typically because it's lacking valid authentication credentials and the request has not been applied for the target resource.
Also if you don't know, the AuthenticationParameters.CreateFromResourceUrlAsync API is obsolete, read more there.
With this in mind, I would look into using AuthenticationParameters.CreateFromUrlAsync(Uri) Method in which should be used. It sends a GET request to the url provided with no Authenticate header. If a 401 Unauthorized is received, this helper will parse the WWW-Authenticate header to retrieve the authority and resource.

Here was the problem, found in the guide:
I am running VS 2015. Once I unchecked this, it worked perfectly.

ErrorMessage:Exchange error:The client and server cannot communicate, because they do not possess a common algorithm

I have .NET program that takes attachments from a particular mailbox id and processes the attachment file.
The problem is we have enables TLS 1.2 and disabled all old versions on windows server. Since then we are facing the following error while trying to communicate with exchange server through my .NET program.
ErrorMessage:Exchange error: The request failed. The underlying connection was closed: An unexpected error occurred on a receive.
InnerExceptionSystem.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.ComponentModel.Win32Exception: The client and server cannot communicate, because they do not possess a common algorithm
below are files I have in my program:
Microsoft.Exchange.WebServices.Auth.dll
Microsoft.Exchange.WebServices.Auth.pdb
Microsoft.Exchange.WebServices.Auth.xml
Microsoft.Exchange.WebServices.dll
Microsoft.Exchange.WebServices.pdb
Microsoft.Exchange.WebServices.xml
Please let me know how I can change my code to resolve this issue.

Xamarin-PCL iOS SignalR via Https Error

I've got a problem when using SignalR on Xamarin-PCL project. The error occurred when connection.start() (The hub url is https) method, But it's worked perfectly on Android.
This is the error message
System.AggregateException: One or more errors occurred. ---> System.Net.Http.HttpRequestException: An error occurred while sending the request ---> System.Net.WebException: Error getting response stream (ReadDone1): ReceiveFailure ---> System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer. --->

Change the SSL/TLS implementation to "Mono (TLS v1.0)"