The IPv6 interface on fndca1.fnal.gov seems to work fine for me:

[2022-01-25 01:01:01.697435 +0100][Debug  ][AsyncSock         ] [fndca1.fnal.gov:1096.0] Attempting connection to [2620:6a:0:4812:f0:0:69:121]:1096
[2022-01-25 01:01:01.697510 +0100][Debug  ][Poller            ] Adding socket 0x8715c0 to the poller
[2022-01-25 01:01:01.800739 +0100][Debug  ][AsyncSock         ] [fndca1.fnal.gov:1096.0] Async connection call returned
[2022-01-25 01:01:01.800825 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Sending out the initial hand shake + kXR_protocol
[2022-01-25 01:01:01.904149 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Got the server hand shake response (type: manager [], protocol version 500)
[2022-01-25 01:01:01.904390 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] kXR_protocol successful (type: manager [], protocol version 500)
[2022-01-25 01:01:01.905555 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Sending out kXR_login request, username: rillingw, cgi: ?xrd.cc=ch&xrd.tz=1&xrd.appname=xrdcp&xrd.info=&xrd.hostname=lxplus7107.cern.ch&xrd.rn=v5.4.0, dual-stack: true, private IPv4: false, private IPv6: false
[2022-01-25 01:01:02.013240 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Logged in, session: 5c90986089a841eb0ba265ed43891fc8
[2022-01-25 01:01:02.013316 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Authentication is required: &P=gsi,v:10400,c:ssl,ca:f5f0dfc2
[2022-01-25 01:01:02.013349 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Sending authentication data
[2022-01-25 01:01:02.015455 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Trying to authenticate using gsi
[2022-01-25 01:01:02.466388 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Sending more authentication data for gsi
[2022-01-25 01:01:02.600920 +0100][Debug  ][XRootDTransport   ] [fndca1.fnal.gov:1096.0] Authenticated with gsi.
[2022-01-25 01:01:02.600977 +0100][Debug  ][PostMaster        ] [fndca1.fnal.gov:1096] Stream 0 connected.

(the data connection worked over IPv6 too, but I'll skip the logging output)
There must be something else going on here.

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