Hello!

We're experiencing issues with older clients vs redirector IPv6 enabled where client host is dual-stack. Relevant piece of behavior is from the log as follows:

[2016-09-02 19:40:10.529888 +0200][Debug ][XRootDTransport ] [cmsxrootd.fnal.gov:1094 #0.0] Sending out kXR_login request, username: zvada, cgi: ?xrd.cc=ch&xrd.tz=1&xrd.appname=xrdcp&xrd.info=, dual-stack: false
...
...

[2016-09-02 19:41:00.221320 +0200][Debug  ][File              ] [0x2000000@root://cmsxrootd.fnal.gov:1094//store/mc/RunIISpring16reHLT80/DYJetsToLL_M-50_TuneCUETP8M1_13TeV-amcatnloFXFX-pythia8/AODSIM/PUSpring16RAWAODSIM_reHLT_80X_mcRun2_asymptotic_v14-v1/40000/003A70D5-E55C-E611-9B14-0025905C53A8.root] Error while opening at cms-xrd-transit.cern.ch:1094: [ERROR] Server responded with an error: [3011] No servers are available to read the file.
[0B/0B][100%][==================================================][0B/s]  
Run: [ERROR] Server responded with an error: [3011] No servers are available to read the file.
$ xrdcp -version
v4.0.4

Forcing XRD_NETWORKSTACK=IPv4 solve the issue on client side, though:

$ XRD_NETWORKSTACK=IPv4 xrdcp -f root://cmsxrootd.fnal.gov//store/mc/RunIISpring16reHLT80/DYJetsToLL_M-50_TuneCUETP8M1_13TeV-amcatnloFXFX-pythia8/AODSIM/PUSpring16RAWAODSIM_reHLT_80X_mcRun2_asymptotic_v14-v1/40000/003A70D5-E55C-E611-9B14-0025905C53A8.root /dev/null 
[80MB/3.495GB][  2%][=>                                                ][8.889MB/s] 
$ xrdcp -version
v4.0.4

Suggestion is provide on the server side a configuration parameter to force dual-stack to true - we'd assume that IPv4 is always present. Clients >=v4.3.x handle dual-stack situation well, but for users running anything below that would be preferable be cautions and act on the server side with config tweak if possible.

Thanks,
Marian

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