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Mystery DUN disconnect

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11 replies

by d'anno

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I have a small home LAN and a couple Win98SE boxes that can use the same phone
line for DUN. One box works fine - can surf for prolonged time without flaw and
stays connected even without activity. The other box has problems:
During a dial-upsession, the modem establishes a connection with my ISP
(actually, at two different numbers), verifies my username and password then
minimizes to SYSTRAY. The SYSTRAY icon indicates some activity (virual 'lights')
and I notice packets received and sent numbers DO increase. I can typically open
MSIE 5.5 or ICQ and successfully load a web page or two. Subsequent attempts
eventually yield an 'Error loading page' message and I notice there is not DUN
activity anymore. If I use PCAnyhwere to connect to a remote host PC, my
connection stays live until manually closed. I have uninstalled DUN and
reinstalled, even per MS Tech instructions. I have manually set the DNS primary and secondary per my ISP to no
avail. I have reduced my modem transmission rate well below the maximum with no
change. I have finally attached an external modem to another COM port and the
same thing happened. I don't think it's the modem or phone line, so what in my
OS or DUN settings cancause this??

11 replies

by redshift

If this happens when the machines are connected to your ISP simultaneously, even at two different numbers, it's because the ISP wants you to have two accounts. Get WinProxy and let the machine without problems be the proxy server and do the dialing.

If this isn't the case, then you have one WEIRD problem, since you verified the functionality of the system sans DUN via PCAnywhere - try reinstalling windows.

by d'anno

Not doing any NAT - PC's are not connected simultaneously. It is very weird! Transmission activity is good initially (48000kbps, etc.) then drops off to nothing after a minute or two. Reconnect and all is well for another minute or two . . . or three. Frustrating!!

by bill cassada

In your DUN you have a "disconnect after..." setting. I doubt this is the problem, but check it to be sure.

I am curious as to what you mean by connecting to two different numbers. Are you doing this simultaneously?? If so, there are a lot of problems that can occur that will cause the ISP to drop the connection. It's not as simple as connecting to two numbers.

Need a little more info on exactly how you are connecting, please.

by d'anno

Can call two different local ISP phone numbers at different times (tride this in case it was the receiving ISP phone system that was the prob.). . . and no, the "disconnect after . . " is set to allow continuous transmission. Thanks anyway.

by grantcom

Seems like I get on an answer and stay on it but here it is....search your system for multiple instances of winsock.dll and Wsock32.dll and rename them to .old

My winsock.dll is 21,504 bytes and version 4.10.1998 Wsock32.dll is 40,960 bytes and is version 4.10.1998

Although this may not be your problem multiple instances can cause some very weird behavior indeed. Note that the winsock.dll is in c:\windows and the Wsock32.dll is in c:\windows\system

If the above does not help I would try going to the modem manf website and try and find some initialization strings for the modem. Strings can greatly improve your connection stability.

by d'anno

This is a good answer, unfortunately, I have already performed the manual uninstall/re-install of DUN per a Microsoft whitepaper which had me rename about 30 files related to DUN and manually extract each (from DOS reboot) from the original cabinet files. I am certain I have the appropriate OS DUN files. I will check for multiple instances though. I also suspect this may be related to an ICQ socket?? Thanks for your insight.

by grantcom

Have you tried creating a log file for your modem...maybe this will shed some light?

by grantcom

I would also try the line connecting to the non-offending, hooking it up identically...i.e. no couplers etc.

by d'anno

Thanks Grant, and I have switched the computers with phone lines to verify it isn't the line (the 'working' PC still works and the other still doesn't). I had a serial mouse and ported a PS2 the other day, thinking it was a conflict for IRQ 4, but still have problems. I think it's either the modem or BIOS setup/resource conflict.

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