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No packet with capture filter

Hello community,

I want to capture traffic to internet with capture filter. For that I use a VLAN on a cisco switch with port mirror to the vlan, existing of only two ports. One port for ethernet output of a dsl-modem, one port to ethernet inferface o the internet router. When I start capturing I see all packets an can set a display filter which works. Stopping capturing and setting a capture filter, like port 5050, no more packet are captured. No tested capture filter will work.
What is wrong? Thanks for any help

Michael