Connection tests shows ok but the app doens't connect

[DaviPtrs]

Self explanable title. I did tests to make sure that my mqtt server is working and receiving packets, even it shows on log when a make a connection test on mqtt client

[JOHLC]

Same issue here:

[clintonpower]

Also having this issue

[RuneNyhuus]

I also have this issue
After Test connection from Windows MQTT Shows this log:
1610364703: New client connected from 10.0.0.10 as e087a86f-654a-416c-bb45-34ff6c51d526 (p2, c1, k60, u'CaMeX').

After Save & Close.. i get this in mqtt log:

1610364727: New connection from 10.0.0.10 on port 1883.
1610364727: Socket error on client , disconnecting.
1610364730: New connection from 10.0.0.10 on port 1883.
1610364730: Socket error on client , disconnecting.