Baudoin, > These are the ALLOW entries at ECMWF: ... > ALLOW ANY tigge-ldm\.cma\.gov\.cn\.?$ .* That should do it, which is why I suspect that the TCP connection from host tigge-ldm.cma.gov.cn doesn't have a source IP address that maps to that name -- as seen by ECMWF. Regards, Steve Emmerson Ticket Details =================== Ticket ID: GJL-544923 Department: Support IDD TIGGE Priority: Normal Status: Closed