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Hi,

I am seeing a python XRootD file open issue for the 5.6.1 client with a 
5.5.5 server :

=============================================================

XRootD Client Versin 5.6.1
XRootD Server Version v5.5.5

open(root://cmsio2.rc.ufl.edu:1094//store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/A64CCCF2-5C76-E711-B359-0CC47A78A3F8.root, 
flags=OpenFlags.READ, timeout=90)
XRootDStatus.code=110 "[FATAL] TLS error: resource temporarily 
unavailable: Unable to connect to cmsio2.rc.ufl.edu; error_ssl"

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/tmp/ipykernel_4179061/812350213.py in <module>
      40                           status.message.replace("\n", "")))
      41                 #pass
---> 42             status, data = f.read(offset=0, size=65536, timeout=90)
      43             if ( not status.ok ):
      44                 print(("\n%s\nread(offset=0, size=65536, 
timeout=90)\n" + \

/opt/cms/services/anaconda3/lib/python3.9/site-packages/XRootD/client/file.py 
in read(self, offset, size, timeout, callback)
     124       return XRootDStatus(self.__file.read(offset, size, 
timeout, callback))
     125
--> 126     status, response = self.__file.read(offset, size, timeout)
     127     return XRootDStatus(status), response
     128

ValueError: I/O operation on closed file

===============================================================

Here, XRootD Server is configured with TLS.

If I remove TLS configuration of the 5.5.5 server, there is no issue.

If I switch to 5.5.5 client, there is no issue.

Is this expected?

Thanks,

Bockjoo

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