CMS has updated xroord-client to 4.6.0 and immediately run into this issue trying to access dCache using xrdcp. (4.5.0 version works fine).

An excerpt from client side debug log:

[2017-03-17 14:08:17.681890 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Sending out the initial hand shake + kXR_protocol
[2017-03-17 14:08:17.681910 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Wrote a message: (0xa0000950), 44 bytes
[2017-03-17 14:08:17.684878 -0500][Dump ][XRootDTransport ] [msg: 0xa0000950] Expecting 8 bytes of message body
[2017-03-17 14:08:17.684909 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received message header, size: 8
[2017-03-17 14:08:17.684920 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received a message of 16 bytes
[2017-03-17 14:08:17.684927 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Got the server hand shake response (type: manager [], protocol version 289)
[2017-03-17 14:08:17.685832 -0500][Dump ][XRootDTransport ] [msg: 0xa0000950] Expecting 8 bytes of message body
[2017-03-17 14:08:17.685901 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received message header, size: 8
[2017-03-17 14:08:17.685921 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received a message of 16 bytes
[2017-03-17 14:08:17.685944 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] kXR_protocol successful (type: manager [], protocol version 289)
[2017-03-17 14:08:17.687749 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Sending out kXR_login request, username: litvinse, cgi: ?xrd.cc=us&xrd.tz=-6&xrd.appname=xrdcp&xrd.info=&xrd.hostname=orbis.fnal.gov&xrd.rn=v4.6.0, dual-stack: true, private IPv4: false, private IPv6: false
[2017-03-17 14:08:17.687865 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Wrote a message: (0xa0000b40), 114 bytes
[2017-03-17 14:08:17.837507 -0500][Dump ][XRootDTransport ] [msg: 0xa0000950] Expecting 49 bytes of message body
[2017-03-17 14:08:17.837576 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received message header, size: 8
[2017-03-17 14:08:17.837598 -0500][Dump ][AsyncSock ] [quantaplex:1094 #0.0] Received a message of 57 bytes
[2017-03-17 14:08:17.837625 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Logged in, session: 1456884d02cd25034454c03a50b59c59
[2017-03-17 14:08:17.837638 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Authentication is required: &P=gsi,v:10200,c:ssl,ca:d690e530
[2017-03-17 14:08:17.837652 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Sending authentication data
[2017-03-17 14:08:17.840156 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Trying to authenticate using gsi
[2017-03-17 14:08:17.847050 -0500][Debug ][XRootDTransport ] [quantaplex:1094 #0.0] Cannot get credentials for protocol gsi: Secgsi: ErrParseBuffer: unknown CA: cannot verify server certificate: kXGS_init
[2017-03-17 14:08:17.847069 -0500][Error ][XRootDTransport ] [quantaplex:1094 #0.0] No protocols left to try
[2017-03-17 14:08:17.847078 -0500][Error ][AsyncSock ] [quantaplex:1094 #0.0] Socket error while handshaking: [FATAL] Auth failed
[2017-03-17 14:08:17.847089 -0500][Debug ][AsyncSock ] [quantaplex:1094 #0.0] Closing the socket

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