Yup. Firewalls are configured port by port, IP address by IP address. Combinations vary to infinity and beyond*. Happens all the time.
*A joke from the movie Toy Story. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of David Logan Sent: Wednesday, January 07, 2009 1:58 PM To: [email protected] Subject: Re: IBM-MAIN 3270 session disconnects If that's the case, why doesn't it drop my AS/400 sessions? Why doesn't it drop my VSE sessions to the same physical machine? Why doesn't it drop my VM session? Why does it only drop my z/OS 1.4, 1.5, 1.8 and 1.9 sessions? The likelihood of it being an emulator problem is virtually zero. And while I will still accept the fact that it might be a firewall problem, the fact is that my z/OS partitions and z/VSE partitions are being serviced by the same OSA, so there are no difference in the machines between my client and server. The only difference is that the misbehaving server seems to be on z/OS, and all of the other TCP/IP servers seems to behave perfectly. I am guessing that you are not trying to imply that my firewall is designed to drop only my z/OS sessions and nothing else :) David Logan Manager of Product Development, Pitney Bowes Business Insight http://centrus.com W: (720) 564-3056 C: (303) 818-8222 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Hal Merritt Sent: Wednesday, January 07, 2009 10:10 To: [email protected] Subject: Re: IBM-MAIN 3270 session disconnects Yes - everything is fine from the firewall (or some other appliance in the path). It is doing as it is configured to do - drop the session. Look in your emulator for a 'keep alive' feature. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Nigel Bowen Sent: Wednesday, January 07, 2009 10:35 AM To: [email protected] Subject: Re: IBM-MAIN 3270 session disconnects We started experiencing this TN3270 disconnect issue in early November. It is only effecting folks who connect to our mainframe TN3270 servers from "outside" & it is typically after five minutes of inactivity. Internal users are not seeing the problem & can remain idle for ages. It does not matter which application they connect to. The "network" connectivity remains active, their TN3270 emulator shows a disconnect so they just issue a "connect" again from the emulator. No useful IST messages. Packet trace just shows disconnect ! Firewall folks say everything is okay. We are just living with it. Our TN3270 servers are z/OS 1.9. Regards, Nigel Bowen Technical Principal FedEx Services NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
