| Port No | 1863 |
| Service Name | msnp |
| RFC Doc | 0 |
| Protocol | TCP |
| Description | MSNP |
| Reference Link | Port No:1863 Service Name:msnp Protocol:TCP |
| Attack | Inbound port 1863 traffic is most likely an attack (no registered services), outbound traffic usually indicates MSN traffic. ActionBlock access outbound to port 1863 for new connections to prevent MSN clients from logging in to the network. |
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