Can't establish a connection due to an invalid certificate (Untrusted certificate not accepted)

Issue Explanation

This message indicates that the app couldn't connect to the Ringotel server due to potential interception of SSL/TLS traffic in the user's network (man-in-the-middle), where an unauthorized SSL certificate is being used.

This could be due to the router settings set to listen in to TLS traffic or due to a malicious attempt or due to network filters intercepting HTTP traffic within the connected network. Since the application works only with Ringotel trusted certificate, to prevent the security breach, the connection was not accepted.

Possible Solution

To address this, it is recommended to specify the certificate's CN in the Allowed CNs parameter provided in the connection settings (Miscellaneous section). This step enables users to register from networks where SSL traffic interception occurs.

Alternatively, to address this issue, please attempt connecting from an alternative network (Wi-Fi or cellular data).