I work at the ISP company & We have Several As5300 & As5400 server's . In, last 4 days we are facing problem that the dial-up users can not login & they are getting Microsoft error " 650 " ( Means : No respond from the emote Access Server ) , Once i checked the calls at the whole Access Server i observed drops on calls & i have to restart the As to act proprly again ( Temp Solution ) . The problem acurred at several times at different Access Server . also No new configuration has been added to the Access Server . Some Access Server once they are effected they give error messege at the Momory ( Low Memory ) but the memory is working fine & i'm sure of that . Is the new virus might cause this problem ? if , yes what is the solution If no , Please to help me in that .