With using the server.xml file from the Spectrum documentation from "Configure OneClick for Secure Sockets Layer" we see that the port 8443 is running but it isn`t possible to connect with browser to https://<hostname>:8443/spectrum/ => errorcode: SSL_ERROR_RX_RECORD_TOO_LONG
Error message "java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens"
However, it is possible to connect to http://<hostname>:8443/spectrum/
Details of investigation:
1. Restore a backup of keystore
2. Verify OneClick works as expected.
As a best practice, always take a backup of keystore.
See "Import a Certificate Authority-Signed Certificate" from the doc link below from Additional Information. The signed CA Certificate must be the exact same one that the CSR was created from, otherwise you will overwrite your PrivateKeyEntry when you import the Signed Certificate.