I had the same crazy problem like for almost 3 weeks. I used to get logged off by 10-11 pm and back on by about 9 am. Followed it up like crazy with the CTO, local sify sh*theads and customer care. Finally it was found that this problem was due to faulty power supply in neighbouring society where my switch resided. Some sh*thead watchman was probably turning the lights off at 10 pm. Anyways the CTO got in an electrician to re route the power supply to the switch. That took care of that problem. Also then had a severe case of broken network pings which again some genius at the CTO solved by buying a better compaq switch or something to that effect. Moral of the story..find a sympathetic dude in the CTO office!!!ankX, Pune