From: Claus Folke Brobak Date: 2011-11-16T21:41:30+09:00 Subject: SSH hangs for 30 sec on AIX Environment: - AIX 6.1 - Java: java version "1.6.0" Java(TM) SE Runtime Environment (build pap3260sr9fp1-20110208_03(SR9 FP1)) IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 AIX ppc-32 jvmap3260sr9-20110203_74623 (JIT enabled, AOT enabled) J9VM - 20110203_074623 JIT - r9_20101028_17488ifx3 GC - 20101027_AA) JCL - 20110203_01 - jruby 1.6.5 (ruby-1.8.7-p330) (2011-10-25 9dcd388) (IBM J9 VM 1.6.0) [AIX-ppc-java] - Gems: - bouncy-castle-java (1.5.0146.1) - jruby-openssl (0.7.4) - net-ssh (2.2.1) Code: require 'rubygems' require 'net/ssh' host = 'xxxxxxx.xxxxxx.xxx' username = 'xxxx' Net::SSH.start(host, username, :verbose => :debug) do |ssh| puts ssh.exec!("hostname") puts ssh.exec!("ls") end When running this program it hangs for 30 seconds at four points, as I have shown below. Note that I have omitted a number of lines. - - D, [2011-11-16T11:53:11.477000 #1213352018] DEBUG -- tcpsocket[7d4]: received packet nr 6 type 52 len 12 D, [2011-11-16T11:53:11.478000 #1213352018] DEBUG -- net.ssh.authentication.methods.publickey[7dc]: publickey succeeded (2d:32:27:ed:60:c8:28:28:77:50:7d:40:d7:83:ef:4b) D, [2011-11-16T11:53:11.482000 #1213352018] DEBUG -- tcpsocket[7d4]: queueing packet nr 7 type 90 len 44 <<< Hangs for 30 seconds, then continues >>> - - D, [2011-11-16T11:53:41.573000 #1213352018] DEBUG -- tcpsocket[7d4]: received packet nr 8 type 91 len 28 I, [2011-11-16T11:53:41.577000 #1213352018] INFO -- net.ssh.connection.session[7de]: channel_open_confirmation: 0 0 0 32768 I, [2011-11-16T11:53:41.579000 #1213352018] INFO -- net.ssh.connection.channel[7e0]: sending channel request "exec" D, [2011-11-16T11:53:41.586000 #1213352018] DEBUG -- tcpsocket[7d4]: queueing packet nr 9 type 98 len 44 <<< Hangs for 30 seconds, then continues >>> - - D, [2011-11-16T11:54:11.556000 #1213352018] DEBUG -- tcpsocket[7d4]: received packet nr 15 type 97 len 12 I, [2011-11-16T11:54:11.558000 #1213352018] INFO -- net.ssh.connection.session[7de]: channel_close: 0 D, [2011-11-16T11:54:11.560000 #1213352018] DEBUG -- tcpsocket[7d4]: queueing packet nr 11 type 97 len 28 <<< Output from hostname command >>> D, [2011-11-16T11:54:11.563000 #1213352018] DEBUG -- tcpsocket[7d4]: queueing packet nr 12 type 90 len 44 <<< Hangs for 30 seconds, then continues >>> - - D, [2011-11-16T11:54:41.510000 #1213352018] DEBUG -- tcpsocket[7d4]: received packet nr 17 type 91 len 28 I, [2011-11-16T11:54:41.514000 #1213352018] INFO -- net.ssh.connection.session[7de]: channel_open_confirmation: 1 1 0 32768 I, [2011-11-16T11:54:41.515000 #1213352018] INFO -- net.ssh.connection.channel[7e2]: sending channel request "exec" D, [2011-11-16T11:54:41.518000 #1213352018] DEBUG -- tcpsocket[7d4]: queueing packet nr 13 type 98 len 28 <<< Hangs for 30 seconds, then continues >>> - - <<< Output from ls command >>> I, [2011-11-16T11:55:11.549000 #1213352018] INFO -- net.ssh.connection.session[7de]: closing remaining channels (0 open) If I switch to Java 5 on AIX instead, the program runs without problems. Also, I can run the same program without problems on Windows XP and Java 6 (from Oracle). Any help in solving this problem would be much appreciated. Claus -- Posted via http://www.ruby-forum.com/.