we have an AD(server1,VM),Exchange(server1,VM) and Mail Marshal STMP(server2) in datacenter,
all the exchange client configured as outlook anywhere, there are about 75 users outlook client and each users have a mobile phone
and configured with active sync.
previously, we having an issue, the connection keep dropping, outlook client intermittently show disconnect even RDP to server as well,
we find out the root cause eventually, this is because all the servers are plug-into the CISCO 5505 firewall, and the internal traffic cause the connection drop
we add-in a gigabyte switch to resolve the issue, and the connection has been smooth for 2 months.
Right now, the same problem occurred, but it not so critical as last time, outlook client intermittently email might not able to send out, even for few kb email.
but after reboot the user pc, the email will sent out eventually.
my questions is, what might be the cause of this issue? it is because of the firewall with throughput of 100mb?