Hello @ialaaka,
we need more details about your lab.
Do you have ACL on a router that could be the reason why tcp_21 is not open ?
Does the service FTP is 'on' on the serveur ?
On Packet Tracer, you can use simulation mode also to help you in troublshooting. You can see packets flowing from one node to another and can also click on a packet to see detailed information categorized by OSI layers. Use the realtime/simulation tab to switch to the simulation mode.
Best regards
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