Cannot use ElasticSearch IP Address as Node URI (does not trust server certificate)

Hello all. This is my first post here, so please bear with me!

Current setup:
-Elasticsearch & Kibana hosted on an ubuntu server with docker (therefore the Elastics API URI is something like for Elasticsearch and xxx:xxx:xxx:xxx:5601 for Kibana)
-C# application run locally on my machine

I have been trying for the life of me to connect to Elastic's API through my C# Application using Serilog and Serilog.Sinks.Elasticsearch. I am only successful when I create a proxy tunnel to Elasticsearch using ngrok. Using the proxy tunnel ( for example) I am able to log to Elasticsearch with no problems whatsoever.

If I use the URI, the container logs the following:

http client did not trust this server's certificate, closing connection Netty4HttpChannel


This is my current configuration in appsettings.json (ngrok):

"Serilog": {
   "Using": [ "Serilog.Sinks.Elasticsearch" ],
   "MinimumLevel": "Information",
   "WriteTo": [
         "Name": "Elasticsearch",
         "Args": {
            "nodeUris": "",
            "connectionGlobalHeaders": "Authorization=Basic xxx",
            "indexFormat": "someindex-{0:MM.yyyy}",
            "autoRegisterTemplate": true,
            "autoRegisterTemplateVersion": "ESv7",
            "typeName": ""

I know many people have faced the above error and I've looked at many forums online but I haven't found the ultimate solution to my problem.

Your help would be very much appreciated.

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