Article - CS389606
Unable to start Connection Server successfully for ThingWorx High Availability (HA) due to "WebSocket error: No subject alternative names matching IP address"
Modified: 23-Jun-2025
Applies To
- ThingWorx Platform 9.5
- Also applicable to ThingWorx Azure IoT Hub Connector
Description
- Unable to start Connection Server successfully for ThingWorx HA
- Below error found in Connection Server log
[NettyClient-NIO-1] ERROR c.t.s.i.t.netty.NettyChannelHandler - [ClientHandler: f84bfd39] WebSocket error: No subject alternative names matching IP address xxxx found, closing connection! javax.net.ssl.SSLHandshakeException: No subject alternative names matching IP address xxxx found at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:131) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:353) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:296) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:291) at ... Caused by: java.security.cert.CertificateException: No subject alternative names matching IP address xxxx found ...
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