Automatic disconnection of client after 90 seconds (AWS)

[RalphKoerber]

Hello

I have a problem connecting the client to an AWS environment.
Always after 90 seconds, the client is automatically disconnected, no matter what I specify in the options.
Specifying
. WithKeepAlivePeriod()
. WithSessionExpiryInterval()
Unfortunately, this does not bring the desired success

I'm currently using .WithWebSocketServer and port 443 since a connection via .WithTcpServer and port 8883 do not even come about due to authentication problems

Project:
VB.NET Framework 4.8.1
MQTTnet Version 4.3.7.1207

I would be grateful for any help

Kindest regards,
Ralph