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Signature for non-protocol traffic on standard port

I've found signature to detect SSH traffic on a non-standard port (not port 22), but is there a signature that detects non-ssh traffic on port 22? Alternatively, is there any suggestions on how to create a custom signature to do this? We are also looking for non-ftp on port 21 or 20

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Re: Signature for non-protocol traffic on standard port

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