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@amadio commented on this pull request.

In src/XrdSys/XrdSysE2T.cc:

> @@ -63,6 +63,12 @@ int initErrTable()
            lastGood = i;
           }
       }
+   // NOTE: On systems without EAUTH (authentication error; currently all Glibc systems but GNU Hurd),
+   // EAUTH is remapped to EBADE ('invalid exchange').  Given there's no current XRootD use of a
+   // syscall that can return EBADE, we assume EBADE really means authentication denied.
+#if defined(EBADE)
+   Errno2String[EBADE] = "authentication failed";
+#endif

Another minor note. Is the assumption that EBADE == authentication failed reasonable? Can something else be mistaken for authentication failure because of this?

Checking a bit, I also figured out that macOS has EAUTH but not EBADE, and on Linux musl doesn't seem to have either. I wonder what happens in that case.

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