Figured it out!
libXrdClient is also loaded (for unrelated reasons, but we can't get rid of it). This forces IPv4-only.
Accordingly, after all is loaded and before we invoke any Xrootd calls, we already set:
env->PutString("NetworkStack", "IPAuto");
However, that seems to put the client in a semi-inconsistent state. I had to next manually call:
XrdNetUtils::SetAuto(XrdNetUtils::prefAuto);
This corrects the getaddrinfo flags used in XrdNetUtils so IPv6 addresses are returned.
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Reply to this email directly or view it on GitHub:
https://github.com/xrootd/xrootd/issues/164#issuecomment-64014284
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