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Bongchul, It looks like a firewall issue to me. Nothing happened for about 47 seconds after the connection attempt until you terminated the notifyme(1) process. Can you ping(1) s-iihr52.iihr.uiowa.edu from the Amazon VM? > I ran notifyme and the results are: > > [ldm@ip-172-31-52-140 ~]$ notifyme -vl- -f ANY -h s-iihr52.iihr.uiowa.edu > 20160811T214838.680695Z notifyme[20785] NOTE notifyme.c:385:main() Starting > Up: s-iihr52.iihr.uiowa.edu: 20160811214838.680542 TS_ENDT {{ANY, ".*"}} > 20160811T214838.680726Z notifyme[20785] NOTE ldm5_clnt.c:460:forn5() LDM-5 > desired product-class: 20160811214838.680542 TS_ENDT {{ANY, ".*"}} > 20160811T214838.681820Z notifyme[20785] INFO error.c:236:err_log() Resolving > s-iihr52.iihr.uiowa.edu to 128.255.26.164 took 0.001055 seconds > ^C20160811T214925.391296Z notifyme[20785] NOTE notifyme.c:66:cleanup() exiting > > Does this look a firewall issue? Regards, Steve Emmerson Ticket Details =================== Ticket ID: SFT-487549 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.