All players trying to join the party need to allow edge traversal in their chivalry 2 firewall rules.
 
 

General

Start > firewall.cpl > Advanced settings > Inbound Rules > Chivalry 2 > Properties > Advanced > Allow Edge Traversal
 
 
There should be 2 inbound rules for chivalry 2. One for UDP and the other for TCP.
 
 

 
 
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