I had a perfectly working kppp on Mandrake 9.2. Unplugged my pc and my external CNET modem when I went on holiday. When I came back, my line would get dropped 1hour, 30 minutes or sometimes even 3 hours after I connet. I have contacted my ISP - no change on their side, as well as the local telephone comapany. My line was tested and that checks out fine.
Also checked all my settings and even swopped the modem with an identical serial modem - no luck.
Anyone got any ideas ?