We have been struggling with the frequent drop from the SQL server (AC data) in the past 5 months. After I install the latest version of AC, the SQL drop off problem is gone. Right now, we can connect more than 30 computers to the AC SQL data. 7 terminal server client to the Server 2003 and 25 P2P terminals. The problem might be related to one of the terminal at our front desk. This tower connect to the server P2P. When I install the new AC V5.0.29, there is an error message "Cannot write to the AC data". When I try to connect to the SQL data again, 3 computers got kick out from the SQL server. After I uninstall and reinstall AC in this tower, all the computers connected with no more problem. We have been using the program for the whole week and did not see any drop again. Thank God its over. Thank you for all your help. Special thanks to Bert for standing with us when we were down.