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Hi all, We have the follownig problem at CGG-LCG2 : When jobs containing lcg-xx commands arrive on our Worker Nodes, some of lcg-xx commands complete successfully but very often they hang for a very long time, until the job proxy expires or the job is deleted by LRMS. But when we log on the worker node where a lcg command is hanging and rerun it manually , it works correctly and the job continue running (until the next lcg command). We tried to unset GLOBUS_TCP_PORT_RANGE variable from workker nodes, but this did not help. Worker Nodes are on a private network and use SE host as router (se1.egee.fr.cgg.com). We configured the masquerading with this line in iptables configuration file : -A POSTROUTING -s 10.0.0.0/8 -o eth1 -j SNAT --to-source 84.14.104.242 We are having this problem since we installed LCG2.6.0 middleware. Is there any explanation to that ? Did any one experience a similar situation ? Thanks in advance for your help. Cheers. Gerald and Ahmed