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Gerry, > We're making progress.... Do we need to have ATT open 111/RPC thru their > firewall, too? No. A downstream LDM will try to connect to the upstream LDM using port 388 first. Only if it can't connect will it attempt to use the RPC portmapper on the upstream host. > I want to do some testing to idd.unidata.ucar.edu. When we randomly tried > it, their firewall blocked the RPC request. Their firewall did more than block the connection attempt: it replied with a TCP reset packet. Shame on it! Regards, Steve Emmerson Ticket Details =================== Ticket ID: AVX-447373 Department: Support LDM Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.