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1. Error: 'No subject alternative names present'
   Meaning: the server CA file, supplied by to the client, contains CN that is not the same as the --hostname
   Example command:

   Code Block
   language bash
   mqtt subscribe --topic # --jsonOutput \ --hostname 127.0.0.1 --port 8883 \ --cafile server.pem

   Code Block
   Unable to connect. Reason: 'No subject alternative names present'

   Reason: When the server.pem has CN that is not the IP address. For example, the server certificate has CN “example.domain.com”.
   Workaround: On the client machine, edit the /etc/hosts and append <ip-address> example.domain.com. This way you can use the command successfully:

   Code Block
   language bash
   mqtt subscribe --topic # --jsonOutput \ --hostname example.domain.com --port 8883 \ --cafile server.pem

2. Error: Unable to connect. Reason: 'No name matching localhost found'

   Code Block
   language bash
   mqtt subscribe --topic # --jsonOutput \ --host somehost --port 8883 \ --cafile server.pem

   Code Block
   Unable to connect. Reason: 'No name matching localhost found'

   Reason: the --hostname does not match the CN of the server.pem
   Solution: Open the server.pem with a certificate viewer and find out the correct CN (hostname).

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