Ah-ha, I think that's indeed what is happening here.
Here's a session where I'm appropriately authenticated:
> PROPFIND //user/ligo/ HTTP/1.1
> User-Agent: curl/7.29.0
> Host: example.unl.edu:1094
> Accept: */*
>
< HTTP/1.1 207 Multi-Status
< Content-Length: 650
< Content-Type: text/xml; charset="utf-8"
<
<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:ns1="http://apache.org/dav/props/" xmlns:ns0="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/" xmlns:lp3="LCGDM:">
<D:href>/user/ligo/</D:href>
<D:propstat>
<D:prop>
<lp1:getcontentlength>4096</lp1:getcontentlength>
<lp1:getlastmodified>Mon, 05 Feb 2018 21:33:42 GMT</lp1:getlastmodified>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:iscollection>1</lp1:iscollection>
<lp1:executable>T</lp1:executable>
<lp1:iscollection>1</lp1:iscollection>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
However, if I don't authenticate:
> PROPFIND //user/ligo/ HTTP/1.1
> User-Agent: curl/7.29.0
> Host: example.unl.edu:1094
> Accept: */*
>
< HTTP/1.1 404 Not found
< Content-Length: 47
<
From the server log for the second access:
180521 16:42:05 18957 unknown.264985:171@example2 XrootdResponse: sending err 3010: Unable to locate /user/ligo/; permission denied
So indeed - instead of a 403 unauthorized I get a rather surprising 404.
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