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`XrdCl` currently has a serious bug when used on dual-stack hosts. The code for detecting network stack support currently looks at the node's hostname and resolves all available addresses for that hostname (which is incorrect: there's no guarantee the hostname is in any way connected to DNS or network address resolution). If `XrdNetUtils` doesn't detect a IPv6 address for the hostname, `XrdCl` will claim to _not_ be dual-stack when logging into a redirector. If it connects to the Xrootd server via IPv6, then the redirector will (incorrectly) identify the worker node as IPv6-only. This results in errors for CMS as the dual-stack host won't be redirected to IPv4-only servers. I would suggest a twofold fix: - If the client believes it is IPv4-only but is communicating with the redirector via a IPv6 socket, login as a dual-stack host. - Determine the network stack support by enumerating the IP addresses on the host via `getifaddrs` instead of relying on the configuration of the worker node's hostname. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/326 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1