Weintek MT8071iE Error Code ERR-507

Weintek HMI Major Communication

Model: MT8071iE | Code: ERR-507

Applicable Systems
cMT Series

Symptoms

MQTT client shows 'Broker Unreachable' and publish messages queue indefinitely.

Possible Causes

  • MQTT broker IP or DNS name changed and not updated in the HMI client settings.
  • TLS/SSL certificate expired on the broker, causing the HMI to reject the connection.
  • Corporate firewall blocking outbound TCP 8883 (MQTT over TLS) from the OT network.

Troubleshooting Steps

  1. Step 1: Verify the broker IP/DNS and port in EasyBuilder Pro MQTT client settings.
    Address resolves correctly and the port matches the broker listener configuration.
  2. Step 2: Check the broker TLS certificate expiration date with openssl s_client or browser.
    Certificate is valid and the HMI CA trust store includes the signing root.
  3. Step 3: Test TCP 8883 connectivity from a laptop on the same VLAN using telnet/nc.
    Connection to broker:8883 succeeds and TLS handshake completes.

How to Reset

Update the broker address, renew or import the TLS certificate, and open firewall port 8883.

Related Weintek Fault Codes

Source: Weintek MT8071iE MQTT Communication Manual

Category: HMI