Make sure your question hasn't been answered in the FAQ!

set the server ip, and the port but i'm getting the error in the title on the client side along with trying to authenticate, and serverside i'm getting VoiceChatPacketProcessingThread/INFO [STDERR/]: [de.maxhenkel.voicechat.voice.server.Server$ProcessThread:run:188]: at java.net.DatagramSocket.send(DatagramSocket.java:693)

Please send me your full logs.

java.io.IOException: Operation not permitted (sendto failed)

It seems that your hoster does not allow custom ports.

https://pastebin.com/nNsKQrye

those were the server logs

[B#625] [23:52:30.960] [Render thread/INFO] [voicechat/]: Received secret
[B#625] [23:52:30.960] [Render thread/INFO] [voicechat/]: Connecting to server: 'ip204.ip-51-81-174.us:6095'
[B#625] [23:52:31.014] [Render thread/WARN] [network.play.ClientPlayNetHandler/]: Unknown custom packet identifier: voicechat:default
[B#625] [23:52:31.014] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:32.017] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:33.018] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:34.018] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:35.018] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:36.018] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:37.019] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:38.019] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:39.020] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:40.020] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:41.020] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:41.204] [Render thread/WARN] [network.play.ClientPlayNetHandler/]: Unknown custom packet identifier: voicechat:default
[B#625] [23:52:41.204] [Render thread/INFO] [voicechat/]: Received secret
[B#625] [23:52:41.204] [Render thread/INFO] [voicechat/]: Disconnecting client
[B#625] [23:52:41.205] [Render thread/INFO] [voicechat/]: Connecting to server: 'ip204.ip-51-81-174.us:6095'
[B#625] [23:52:41.205] [Render thread/WARN] [network.play.ClientPlayNetHandler/]: Unknown custom packet identifier: voicechat:default
[B#625] [23:52:41.205] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:42.205] [VoiceChatAuthenticationThread/INFO] [voicechat/]: Trying to authenticate voice connection
[B#625] [23:52:42.671] [Render thread/INFO] [gui.NewChatGui/]: [CHAT] [Server: Saved the game]
[B#625] [23:52:42.726] [Render thread/INFO] [STDOUT/]: [xaero.common.XaeroMinimapSession:cleanup:67]: Minimap session finalized.
[B#625] [23:52:42.738] [Render thread/INFO] [voicechat/]: Disconnecting client

and those are the client logs from connecting to disconnect