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Hi,

With ROOT's build of its builtin xrootd-5.4.3 client on macOS 12.5.1 (and only there), just opening the file with

TFile::Open("root://eospublic.cern.ch//eos/root-eos/cms_opendata_2012_nanoaod_skimmed/ZZTo4mu.root")

always hangs for > 40 minutes with

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007ff80250e3ea libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007ff802548a6f libsystem_pthread.dylib`_pthread_cond_wait + 1249
    frame #2: 0x000000011ecb0dbb libXrdUtils.3.0.0.dylib`XrdSysCondVar::Wait(this=0x00007ff7bfefc0c0) at XrdSysPthread.cc:106:11 [opt]
    frame #3: 0x000000011d5339e0 libXrdCl.3.0.0.dylib`XrdCl::MessageUtils::WaitForStatus(XrdCl::SyncResponseHandler*) [inlined] XrdCl::SyncResponseHandler::WaitForResponse(this=0x00007ff7bfefc0a8) at XrdClMessageUtils.hh:97:20 [opt]
    frame #4: 0x000000011d5339b1 libXrdCl.3.0.0.dylib`XrdCl::MessageUtils::WaitForStatus(handler=0x00007ff7bfefc0a8) at XrdClMessageUtils.hh:157:18 [opt]
    frame #5: 0x000000011d56b797 libXrdCl.3.0.0.dylib`XrdCl::File::Open(this=<unavailable>, url=<unavailable>, flags=<unavailable>, mode=<unavailable>, timeout=0) at XrdClFile.cc:127:12 [opt]
    frame #6: 0x0000000111f3555f libNetxNG.so`TNetXNGFile::TNetXNGFile(this=0x0000000111e3b7a0, url=<unavailable>, lurl=0x0000000000000000, mode="", title=<unavailable>, compress=<unavailable>, (null)=<unavailable>, parallelopen=<unavailable>) at TNetXNGFile.cxx:198:20 [opt]
    frame #7: 0x0000000111f35840 libNetxNG.so`TNetXNGFile::TNetXNGFile(char const*, char const*, char const*, int, int, bool) [inlined] TNetXNGFile::TNetXNGFile(this=<unavailable>, url=<unavailable>, lurl=0x0000000000000000, mode=<unavailable>, title=<unavailable>, compress=<unavailable>) at TNetXNGFile.cxx:142:1 [opt]
    frame #8: 0x0000000111f35831 libNetxNG.so`TNetXNGFile::TNetXNGFile(this=<unavailable>, url=<unavailable>, mode=<unavailable>, title=<unavailable>, compress=<unavailable>, netopt=<unavailable>, parallelopen=<unavailable>) at TNetXNGFile.cxx:132:2 [opt]

Is this a known issue? Are we doing something wrong?

FYI @eguiraud who diagnosed this.

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