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We have remote users connecting to our system via the internet and executing an AS/400 application. One of our users has 5 physical locations each connecting to the internet in their own way and through different ISP's. Two of them use cable modems, one uses ISDN, and two use 56K dialups. Each location is using peer to peer networking. Between the ISP and the hub is again various devices acting as DHCP servers( UGATE, Linksys Router, WebRamp 410, Trendware Proxy sharing device). The application is front ended with GUI/400 and printers are setup as Client Access Express printer sessions. The problem is that at each of these 5 physical locations the AS400 is disconnecting from the sessions at random and various times. They may be ok for 3 hours and then bang they drop or it might drop after 30 minutes. The only consistency is that at sometime during the day the session will drop. The internet connection remains and the user can reconnect to the AS400 without any problems. The QEZJOBLOG for the session shows an error CPF5140 which indicates that the session was stopped by a request from the device. The shutdown was caused by either the user turning off the power, a device error or the ascii controller inactivity timer expiring. It is not an ascii controller and the user is not turning off the power so all that is left is a device error. I don't think it is a timeout problem on the AS400 because we setup one of the pc's to issue a ping every 10 seconds so we don't have a period of inactivity and that pc also loses its connection. Strangely enough if we setup a standalone pc with a modem th at dials into the internet by itself without the network the problem goes away. We have checked settings on the DHCP server to deactivate max idle time timeouts. Does anyone have any suggestions or ideas or are we going to have to go to installing a sniffer. Everything seems to point to the peer to peer networks. The PC's are running Windows 98 and one may be running Windows 95. They use various NIC's and the cabling has been checked.
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Telnet sessions losing connection
Ken wrote: "Does anyone have any suggestions or ideas or are we going to have to go to installing a sniffer." Reminds me of the shop that had PC's dropping off the twinax controllers like flies all over the place with the same error message. Turned out that the flourescent lights were playing havoc with unshielded wiring. The AS/400 was mighty unforgiving on missed polls. Don't know how it is nowadays going through the virtual controllers. I might suggest that if it's not too much trouble for you Advanced BusinessLink would probably give you a Strategi server to try. They have their own implementation of virtual controllers and if there is a disconnection accidentally or on purpose the session stays alive for a configurable number of minutes and a reconnection will pick back up on it. That might give some additional insight to the problem. Ralph ralph@ee.net -
Telnet sessions losing connection
Ken, Looks like you are suffering from intermittent network congestion. Are you using a 100 Mb ethernet line? And is your AS/400's ETHLINE description is a model 2838? If both conditions are true, make sure the line is set to 100 Mb speed and *FULL Duplex. Please note that this may not solve all your problems (example: PCs with slower LAN cards). Network management is a complicated job. Perhaps you should consider purchasing some software to monitor problem areas. Or at least download some evaluation software from the internet so you can get some short-term assistance.Comment
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Telnet sessions losing connection
Did this problem start when you added a device/netcard? One customer changed all cards to 3COM and the problems you describe went away. bobhComment
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Telnet sessions losing connection
We are Using a 10m line and Half Duplex. This configuration does work for other users that are having no problems at all. Thanks for your response. Do you have any recommendations for monitoring software to download?Comment
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Telnet sessions losing connection
Ken, Check out http://www.solarwinds.net I have not tried out their evaluation software, but their literature seem pretty impressive.Comment
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Telnet sessions losing connection
Thanks for the info, I'll give it a try. Just as an update the customer purchased some static IP addresses for their site that uses ISDN. It appears so far (24 hours) that their problem has been fixed at that location. We don't know why the static ip address works and the dhcp assigned address doesn't but I think we have made a little progress in determining the problem. We are going to try static ip addresses at a cable modem site to see if it solves the problem there. Any ideas as to why this works.Comment
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Telnet sessions losing connection
Are both the ISDN and static addresses new factors, so that the higher speed connection could be the reason it works instead of a problem with DHCP connections? Or do you have DHCP connections running at just as fast a connection and still dropping out? Ralph ralph@ee.netComment
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Telnet sessions losing connection
The site that installed static ip addresses has always been an isdn site and they were losing connections to us when using dhcp addresses. They also have two cable modem sites that are losing connections, we are going to try static ip addresses at one of those sites to see if it resolves the problem. The static ip addresses are being treated as temporary fixes until we can determine why dynamic addresses are not working.Comment
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