@rob-c I tried to extract one full transfer from the logs with more http info:
https://gist.github.com/kreczko/66f0d2fb47865821b8933b88045b87eb#file-one-full-transfer

This is what happens around checksum request, then time out:

220713 14:17:30 124 Xrd_Sched: running chksum inq=0
220713 14:17:30 124 Xrootd_jobXeq: Job chksum /xrootd/cms/store/data/Run2018A/EGamma/NANOAOD/UL2018_MiniAODv1_NanoAODv2_GT36-v1/70000/4DC52ADD-551B-7242-8334-B97E6348B997.root started
220713 14:17:30 124 http_Req:  XrdHttpReq::Data! final=True
220713 14:17:30 124 7dc42260.738:[log in to unmask] http_Req: PostProcessHTTPReq req: 3 reqstate: 1
220713 14:17:30 124 7dc42260.738:[log in to unmask] http_Req: Checksum for HEAD /xrootd/cms/store/data/Run2018A/EGamma/NANOAOD/UL2018_MiniAODv1_NanoAODv2_GT36-v1/70000/4DC52ADD-551B-7242-8334-B97E6348B997.root adler32=30032735
220713 14:17:30 124 7dc42260.738:[log in to unmask] http_Protocol: Sending resp: 200 header len:97
220713 14:17:30 124 http_Protocol: Sending 97 bytes
220713 14:17:30 124 http_Req:  XrdHttpReq request ended.
220713 14:17:30 124 Xrd_Poll: Poller 1 enabled 7dc42260.738:[log in to unmask]
220713 14:17:30 124 Xrootd_jobSendResult: sent async ok to 7dc42260.738:[log in to unmask]
220713 14:17:30 124 Xrootd_jobXeq: Job chksum /xrootd/cms/store/data/Run2018A/EGamma/NANOAOD/UL2018_MiniAODv1_NanoAODv2_GT36-v1/70000/4DC52ADD-551B-7242-8334-B97E6348B997.root completed
220713 14:17:39 124 Xrd_Sched: running 7dc42260.94:[log in to unmask] inq=0
220713 14:17:39 124 http_Protocol:  Cleanup
220713 14:17:39 124 XrdLink: Unable to send to 7dc42260.94:[log in to unmask]; connection timed out
220713 14:17:39 124 http_Protocol:  SSL_shutdown failed
220713 14:17:39 124 http_Protocol:  Reset
220713 14:17:39 124 http_Req:  XrdHttpReq request ended.

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