@duncanrand - indeed, we haven't forgotten about the IPv6-only case. However, the options here are all bad: - Disable IPv6 completely. Very undesirable. - Disable IPv6 until buggy client is no longer used (2019). Very undesirable. - Break protocol to assume IPv4 connectivity is available. Undesirable. - Break protocol until buggy client is no longer used (2019), then switch off protocol break and fix IPv6-only clients. Slightly less undesirable. So, we'll have things correct once the oldest clients are cycled out. I just feel that breaking IPv6-only cases is a better alternate than turning off IPv6 completely. Andy - is there any other trick to identify old clients that are connecting to the server? I didn't see a version string passed to the `kXR_login` command. -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/411#issuecomment-246481911 ######################################################################## 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