Issues

• Issue with identifying messages that have been sent

  dotnet/MQTTnet#2260 · Filter by author dgxhubbard opened on Aug 31, 2026
  3

• Server: DISCONNECT with DisconnectWithWillMessage reason code is ignored — Will message is not published

  bug
  dotnet/MQTTnet#2256 · Filter by author driedel152 opened on Jul 16, 2026

• Offline-first message buffer with sequence-number-ordered replay for ManagedClient

  dotnet/MQTTnet#2249 · Filter by author rambudithe opened on May 7, 2026

• DisconnectedAsync is not raised if (failed) Publish attempts were made

  bug
  dotnet/MQTTnet#2244 · Filter by author StefanLochauMF opened on Apr 14, 2026

• Create version of MQTTnet.Extensions.ManagedClient that is compatible with version 5 of MQTTnet

  feature-request
  dotnet/MQTTnet#2243 · Filter by author dwe-alan opened on Apr 11, 2026
  3

• CONNECT packet must have at least 7 bytes.

  question
  dotnet/MQTTnet#2236 · Filter by author andycheng-jiuluomall opened on Feb 25, 2026
  2

• Subscriber stops receiving mid-run with QoS2 and 200KB payloads (still connected, no errors)

  bug
  dotnet/MQTTnet#2234 · Filter by author ooredm opened on Feb 12, 2026

• Ambiguity in MQTTnet’s Support for MQTT 5 “Request Response Information” and “Request Problem Information

  dotnet/MQTTnet#2221 · Filter by author hadilbenmoussa opened on Nov 24, 2025
  1

• Intermittent Disconnections Between IoT Edge Module and Mosquitto MQTT Broker

  dotnet/MQTTnet#2220 · Filter by author shourikasa opened on Nov 19, 2025
  2

• Question/Feat: Expose MQTT Client connection status

  question
  dotnet/MQTTnet#2219 · Filter by author WizMe-M opened on Nov 7, 2025
  1

• MQTTnet 4.3.3.952 - ClientId and Payload mismatch under high load

  bug
  dotnet/MQTTnet#2203 · Filter by author Kirubhashini07 opened on Sep 16, 2025
  6

• MQTTnet(2000 links) eating more and more memories until the system was crashed.

  bug
  dotnet/MQTTnet#2195 · Filter by author zmrbak opened on Aug 10, 2025
  1

• Provide an Abstractions package

  feature-request
  dotnet/MQTTnet#2183 · Filter by author thompson-tomo opened on May 9, 2025
  1

• MqttClient.IsConnected false after successful connect

  bug
  dotnet/MQTTnet#2180 · Filter by author ghost opened on Apr 29, 2025
  2

• Performance: Limited publish through-put when there are many idle clients

  bug
  dotnet/MQTTnet#2174 · Filter by author AlexNik4 opened on Apr 11, 2025

• MqttConnectionHandler race condition

  dotnet/MQTTnet#2173 · Filter by author xemed-ahope opened on Apr 10, 2025

• Support ClientCertificateContext on SslClientAuthenticationOptions when connecting to TLS server

  feature-request
  dotnet/MQTTnet#2169 · Filter by author rmaffitsancsoft opened on Mar 24, 2025
  1

• Help to analyze an issue due to slowness

  question
  dotnet/MQTTnet#2165 · Filter by author AlbertoVPersonal opened on Mar 6, 2025
  1

• WithClientCertificates Fails with Disposed X509Certificate2 Object (Possible Reference Retention)

  bug
  dotnet/MQTTnet#2157 · Filter by author uriel-kluk opened on Feb 21, 2025
  1

• Question - When to call UseMqtt() for Kestrel

  dotnet/MQTTnet#2156 · Filter by author wobbet opened on Feb 19, 2025
  1

• mqttnet 3.1.1 Qos 2 issue

  dotnet/MQTTnet#2145 · Filter by author ree-g-dass opened on Jan 28, 2025

• Connection timeout when system time is set to a time in the past

  bug
  dotnet/MQTTnet#2128 · Filter by author andreasgrosche opened on Dec 16, 2024
  1

• About the memory error problem of InjectApplicationMessage of MqttServer in client.WithCleanSession(false)

  bug
  dotnet/MQTTnet#2113 · Filter by author xljiulang opened on Nov 21, 2024

• ASP net apps consuming data use a lot more memory than console apps

  bug
  dotnet/MQTTnet#2112 · Filter by author q-bertsuit opened on Nov 20, 2024
  2

• About socket.LingerState in MqttTcpChannel

  dotnet/MQTTnet#2105 · Filter by author xljiulang opened on Nov 18, 2024