Dreamweaver CS5 chrashes network connection

Hi there.
I have a major problem.
When i try to Synchronize with a server in Dreamweaver CS5 its crashes my network connection and i have to run diagnostic to get online again. When i use other programs to upload anything by FTP there is no problems...
Machine:
Win 7 Ultimate (ENG)
Dual core 2,4Ghz
4 GB Ram
Atheros L1 Ethernet 10/100/1000Base-T Gigabit
Anybody how can help me?
Kind regards
BJ

Could port 21 be blocked? If so, how can I open it.
I tried opening it using info from another thread using this command:
+sudo ipfw add allow tcp from 21 to 21+
But no go...

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