Hi @alexkosior,
this looks like you setup the JS bindings to connect to the gRPC Ledger API running on port 6865. The JS bindings should connect to the HTTP JSON API instead which is running on port 7500 by default. By default the port is selected to be the same as window.location in your browser which works if you have a reverse proxy like webpack-dev-server during development or nginx in production that hosts your frontend on the same port as the JSON API. If they run on a different port or you run outside of a browser, you can set the httpBaseUrl field when constructing DamlLedger to the host and port the JSON API is running on.
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