TLS alert
TLS alert: protocol_version
As text you can copy
protocol_version - Kind
- Alert
- Where you meet it
- While a secure connection is being set up or used
What does protocol_version mean in TLS?
The protocol version the other side tried to negotiate is recognised but not supported.
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What it means in trading API work
One side speaks a TLS version the other has switched off. Typically an old client offers a version the server no longer accepts.
This part is this site's own explanation, written for people learning to call a trading API. It is not part of the source cited above and it describes no particular broker.
What should I do about protocol_version?
Update the client's runtime and TLS library so that it can use a current TLS version, and remove any setting that forces an old one.
This page is an independent explanation in plain words. The definition itself is in the source it was read from, which is the authority if the two ever differ.