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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I’m having an occasional problem with SMTP queue hangs. I don’t have it nailed down yet, but it seems to only occur when there is a large amount of smtp mail in the queue and it takes longer than “smtp timer” to deliver. (I have smtp timer set to 600, i.e. 10 min.) My supposition is that when smtp timer fires, JNOS gets confused if it is still processing the queue from the previous scan.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The symptoms are:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>This only happens when there is a large amount of smtp mail in the queue (many messages, each of which is a few KB in length) such that it takes longer than “smtp timer” to deliver (over 1200 baud radio).<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>“tcp status” shows the machine is in an smtp session with another machine, but there is no activity on the radio port.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Lock files exist for the stuck messages. I presume this prevents the next queue run from touching them.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I get alerted to the problem because I have a shell script run by cron which looks at the mail queue for messages that are older than 2 x “smtp timer”. Before the shell script, messages could be stuck for a very long time and I would never know it.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>To overcome the situation, what I do is:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Check “tcp status” to find the control block number for the hung smtp session<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Use “tcp reset <control-block-#>” to kill the session<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Use “smtp kick” to start things back up again<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Wingdings'><span style='mso-list:Ignore'>n<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Alternatively, restarting JNOS also works , but is obviously more disruptive.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I plan to increase “smtp timer” from 600 to 900 to see if the problem is avoided (more often). But if my assumption is correct, this would only avoid more instances of the problem, not eliminate the problem, and it would do so at the expense of slower mail delivery.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can someone with C language skills look at the code to see if it handles the case where “smtp timer” fires while the previous queue is still being processed? If that case is handled, how is it handled?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>BTW, this is NOT new to 2.0k.rc.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Michael<o:p></o:p></p><p class=MsoNormal>N6MEF<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>