Errors appear randomly during communication

[Plamena Grigorova]

Hello.

I'm having a couple of errors appear randomly during communication with rabbitMQ server.

The server runs on Debian 4.19.181-1 (2021-03-19),  RabbitMQ 3.8.17 on Erlang 24.0.2

The client is an implementation of alanxz / rabbitmq-c v0.11.0 using https://github.com/openssl/openssl/tree/OpenSSL_1_1_1-stable. It's running on a Windows 10 PC.

Also certificate verification is disabled in amqp:

amqp_ssl_socket_new(amqp_connection_state_t state) {
  struct amqp_ssl_socket_t *self = (struct amqp_ssl_socket_t *) calloc(1, sizeof(*self));
...
  self->verify_peer = 0;
  self->verify_hostname = 0;

...

When I start my client it runs fine, receives and sends messages for a while, and then, without any noticeable reason, the connection breaks with one of the following errors logged on the server:

2021-06-17 15:25:33.636 [error] <0.29125.2> closing AMQP connection <0.29125.2> (my_ip:20175 -> srvr_ip:5671):
{inet_error,{tls_alert,{unexpected_message,"TLS server: In state connection at tls_record.erl:558 generated SERVER ALERT: Fatal - Unexpected Message\n {unsupported_record_type,105}"}}}

2021-06-17 15:32:12.208 [error] <0.14738.2> closing AMQP connection <0.14738.2> (my_ip:10553 -> srvr_ip:5671):
{inet_error,{tls_alert,{bad_record_mac,"TLS server: In state connection at ssl_record.erl:446 generated SERVER ALERT: Fatal - Bad Record MAC\n decryption_failed"}}}

Any help on how to pinpoint the reason for these errors would be greatly appreciated.