CopyServerToClient received an error: read: i/o timeout

[SeyedHosseinTafakh]

hi i have a problem .
i run the server on ubuntu 20.04 and client on windows
i put the default config files but the connection can not hold for longer than couple of minutes

logs on windows client

shapeshifter-dispatcher.exe -transparent -client -state state -transports Replicant -proxylistenaddr 127.0.0.1:1443 -optionsFile ConfigFiles\ReplicantClientConfigV3.json -logLevel DEBUG -enableLogging
Dialing
!! CopyClientToServer received an error from io.Copy:
(0x80fa20,0xc00004fae0)
%s(%s) - closed connection Replicant
Dialing

!! CopyServerToClient received an error: read: i/o timeout

logs on ubuntu server :

./shapeshifter-dispatcher -transparent -server -state state -target 127.0.0.1:3333 -transports Replicant -bindaddr Replicant-SERVER_IP:2222 -optionsFile ~/shapeshifter-dispatcher/ConfigFiles/ReplicantServerConfigV3.json -logLevel DEBUG -enableLogging
Replicant listening on SERVER_IP:2222
accepted
failed to connect to ORPort: dial: connect: connection refused
accepted

!! CopyServerToClient received an error: read: i/o timeout

i had other errors too : failed to connect to ORPort: dial: connect: connection timed out
any one know why this happening ?