we have a new leased line 128 Kbps for internet, i have windows 2000 SP4 and exchange 5.5 SP4,
and we have 400 users in our network, before 3 days the performance of leased line is good but from 3 days its very slow.
When i ping to ISP proxy server it is taking 1000 to 12000 milli seconds of time, before it was only 60 - 80 milliseconds.
from ISP side they are using some traffice utilization tools and they are saying that the complete bandwidth 128 Kbps is utilized for internet .
But we have only 5 users who can access internet and exchange 5.5 is connected.
If the problem with exchange traffic, before it was good , the problem is coming since 3 days only.
and another last hint is , we have another leased line to connect our remote brance, since 4 weeks that is also getting same problem.