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UNKNOWN_EXCEPTION: An unexpected error occured. Please include this ErrorId if you contact support: 1947494642-286

I googled the error and found 2 references but neither matched with my situation.

This one is about the lifespan of a QueryMore cursor:

This one is about an S-Control (no responses):

I have contacted support (basic) and they were unable to assist me even though I provided the ErrorId.

I've tracked it down to a System.Web.Services.Protocols.SoapException, does anyone know about the originator of the message?

Is that a SF errorID or something in the protocol / windows OS?