Hi @abh3, thanks for the quick response. I thought that odd, but when running the same on another machine, `klist` reports
```
Ticket cache: FILE:/tmp/krb5cc_26010
Default principal: [log in to unmask]
Valid starting Expires Service principal
28/03/23 13:40:41 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
28/03/23 13:40:42 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
28/03/23 13:40:42 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
```
`xrdcp` runs successfully and the relevant debug output is
```
[2023-03-28 13:41:40.390934 +0100][Debug ][XRootDTransport ] [eoslhcb.cern.ch:1094.0] Logged in, session: 08e27e00c233040087020000f1e28600
[2023-03-28 13:41:40.390942 +0100][Debug ][XRootDTransport ] [eoslhcb.cern.ch:1094.0] Authentication is required: &P=krb5,[log in to unmask]&P=gsi,v:10600,c:ssl,ca:5168735f.0|4339b4bc.0&P=sss,0.+13:/etc/eos.keytab&P=unix
[2023-03-28 13:41:40.390956 +0100][Debug ][XRootDTransport ] [eoslhcb.cern.ch:1094.0] Sending authentication data
[2023-03-28 13:41:40.395140 +0100][Debug ][XRootDTransport ] [eoslhcb.cern.ch:1094.0] Trying to authenticate using krb5
[2023-03-28 13:41:40.452315 +0100][Dump ][AsyncSock ] [eoslhcb.cern.ch:1094.0] Wrote a message: (0x3c0052c0), 2838 bytes
[2023-03-28 13:41:40.509026 +0100][Dump ][XRootDTransport ] [msg: 0x3c000a00] Expecting 0 bytes of message body
[2023-03-28 13:41:40.509080 +0100][Dump ][AsyncSock ] [eoslhcb.cern.ch:1094.0] Received message header, size: 8
[2023-03-28 13:41:40.509108 +0100][Dump ][AsyncSock ] [eoslhcb.cern.ch:1094.0] Received a message of 8 bytes
[2023-03-28 13:41:40.509153 +0100][Debug ][XRootDTransport ] [eoslhcb.cern.ch:1094.0] Authenticated with krb5.
```
After this `klist` output changes to
```
Ticket cache: FILE:/tmp/krb5cc_26010
Default principal: [log in to unmask]
Valid starting Expires Service principal
28/03/23 13:40:41 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
28/03/23 13:40:42 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
28/03/23 13:40:42 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
28/03/23 13:41:40 28/03/23 23:40:39 [log in to unmask]
renew until 04/04/23 13:40:41
```
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