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Thanks for the debugging @olifre ! Indeed, between 4.x and 5.x, the TLS code supporting HTTP was completely rewritten. It went from direct calls in XrdHttp to OpenSSL to having `XrdHttp` invoke some shared code (`XrdTls`, also used by the `xrootd` protocol implementation) which then invokes OpenSSL. So, given the amount of new code, it's not particularly surprising this is 5.x specific -- and that probably is useful in narrowing down the source of the problem. There's some tricky locking required to enable concurrency. Could you do a thread dump when this occurs (`pstack $(pidof xrootd)` from the command line) and see if there's anything obviously stuck? -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1252#issuecomment-658401808 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1