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Losing connection to internet & having to drop lines on router before being able to re-establish connection

Posted on 2003-03-14
Medium Priority
Last Modified: 2013-11-29
We have an ISDN connection to the internet and are using an ISDN router which is connected to a ISA server which is providing firewall protection for one PC which we use to connect to an SQL server in London so that we can create databases.  The ISA server has 2 network cards, one connected to the router and one connected to the single PC and DHCP is disabled on both the router and the server and only static IP addresses are used.  The router is set up to dialup 64kbps with the idle timeout at 180 secs.  Our problem is that occasionally the PC will lose connection with the internet usually half way through the building of a SQL databse, thus I cannot see it being a timeout issue, and the only way to make any sort of connection is to go to the router control panel and manually drop the connected line (the connection is not dropped at the router) and once this is done we are able to re-establish the connection to the internet.  Even when we have lost connection to SQL server and all other internet sites data is still being sent and received according to both the network connection monitor on the PC and on the router.  The ISA server is wide open as I am only going to tighten it up once I am satisfied that the internet connection is reliable, and besides which the problem still occurred when I connected the PC directly to the router and bypassed the ISA server. Can anybody please help?  
Question by:Pilky
LVL 79

Expert Comment

ID: 8137301
What kind of router do you have?

Expert Comment

ID: 8137410
The only ISDN router I have used is the 3Com OfficeConnect series.  I don't know if you have unlimited internet access or if you are billed on so much time a month, but if you have unlimited usage, I would turn the timeout setting to zero.  I believe this is the setting that will keep the router from timing out at all.  I had to set this at one of our accounts because the router would disconnect at inappropriate times.  Even though you are actually using bandwidth on the ISDN line, I have seen instances when I've lost connection due to inactivity (according to the router)when I'm actively browsing, etc.

Of course, there's always the possibility of a defective router or phone line but I would start with the timeout setting first.  I hope this helps.

Expert Comment

ID: 8141041
The 3com isdn router you are using costs 1.25$ to manufacture. I have had a lot of problems with two of my sites that use them.

Maybe but a cheap cisco router (Cisco 1720)

Good luck
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Author Comment

ID: 8146797
The router is a Vigor 2600x.  I am struggling to accept that it is a timeout problem, it drops out when the user is busy and the idle timeout is set to 180 secs.  The only way to reconnect is to drop the lines, once the line has been dropped you reconnect even if another application dials up and the counter is not at zero, it is almost as if other internet traffic which I do not know about is slowing things down and dropping the line purges the wire and enables us to remake our connection.  I could do with a good way of monitoring what, or which applications, could be taking up our bandwidth, the problem does only seem to arise in the afternoon.

Expert Comment

ID: 9153110
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