There is no problem.
Thats how this "protocoll" works or does not work depending on the networksetup. So nothing to be fixed.
DP is not used for good reasons, as it can at best be used for turn based stuff or chat, where even using tcp directly most likely ends with an easier and far better solution.
There are networking systems for Blitz you could use that base on UDP and / or tcp and offer similar functionality without the problems of DP. (one that springs to my mind is GNet)
Thats how this "protocoll" works or does not work depending on the networksetup. So nothing to be fixed.
DP is not used for good reasons, as it can at best be used for turn based stuff or chat, where even using tcp directly most likely ends with an easier and far better solution.
There are networking systems for Blitz you could use that base on UDP and / or tcp and offer similar functionality without the problems of DP. (one that springs to my mind is GNet)