| Port No | 21 |
| Service Name | NokNok |
| RFC Doc | 0 |
| Protocol | TCP |
| Description | Works on Windows 95, 98, ME and 2000. Does NOT work on Windows NT. |
| Reference Link | Port Number:21 Service Name:NokNok Port:TCP |
| Attack | Anti-protection trojan / Remote Access / Steals passwords / IRC trojan / Port scanner |
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