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Hi Gregory,
>
> However is that something you expect with the new versions and not the 
> older ones? If I use the older xrootd version then it works fine still.
The way the name resolution worked changed between versions with newer 
versions returning a null pointer if the lookup failed (older versions just 
returned the ip address in character form). Unfortunately, that had the 
side-effect of crashing anyone who didn't check foir a null pointer. The 
update now prints a nasty error message and exits the program. I suppose we 
technically don't need the name and could use the ascii form of theip 
address but without a real name the security stuff gets mucked up. We made 
the assumption that there really was no reason to use unregistered machines 
(well in production practice anyway). You can, of course, say that is not a 
reasonable restriction.

Andy