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Hi @abh3 -

Thought a bit more on the idea of `XrdProtocolAnon` over the weekend.  The primary problem I see is the lack of compatibility for older clients -- the whole reason I delved into this proposed "anonymous mode" over the weekend was I have a use case where:

1.  The network is secure (no MiTM).
2.  I want to support users with a variety of old CMSSW versions.

I still like the idea of having a separate token authentication protocol - but that's a touch more work (and will require a new client).

So, I see two potential routes here:
1. We go forward with this new flag for the existing `XrdSecunix` plugin.
2. We implement a `XrdSecAnon` plugin that advertises itself at the wire protocol level as `unix`.  One keeps compatibility with old releases but the local site admin has to very explicitly load it (can't operate in this mode by accident -- although I would guess the `sec.protocol unix anonymous` in the existing patch is pretty explicit...)

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