writting alert rules

[Akinwale Fasuru <fashman2k1 () yahoo com>]

Hi,
I wrote a rule for alert on visiting www.youtube.com
alert rule
alert tcp any any => any any (msg:"someone is on youtube now!"; content:"www.youtube.com"; sid:1000002;rev:1;)

Here is the response i got when i go on youtube

10/25-22:29:59.126487  [**] [129:15:1] Reset outside window [**] [Classification: Potentially Bad Traffic] [Priority: 
2] {TCP} 157.56.134.97:80 -> 192.168.64.133:42987

Can somebody help pls, not sure what is wrong

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