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Hi, At RAL, they see the following on their outgoing proxy servers (repeating for about a minute before the file-open times-out at the application side):<<FNORD When our xrootd proxy cluster is busy, there are sometimes messages like this in the logs: 140626 16:53:25 24465 ofs_Stall: Stall 3: File 2EF5AF84-D65A-E311-AB3F-02163E00A0E1.root is being staged; estimated time to completion 3 seconds for /store/mc/Fall13/QCD_Pt-5to10_Tune4C_13TeV_pythia8/GEN-SIM/POSTLS162_V1_castor-v1/10000/2EF5AF84-D65A-E311-AB3F-02163E00A0E1.root 140626 16:53:25 24465 pcms054.6545:147@lcg1353 XrootdProtocol: stalling client for 3 sec 140626 16:53:25 24465 pcms054.6545:147@lcg1353 ofs_close: use=0 fn=dummy FNORD This probably means that the remote file can not be opened for some reason (like being delayed by external redirector/server)? Would there be a special error if the socket can not be opened (due to fd or firewall limits ... or some other internal limits)? Note that this only happens when the proxies are already under heavy load. What options should they set to debug this? pss.memcache debug ??? xrd.trace conn xrootd.trace redirect Matevz ######################################################################## 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