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Unable to connect to license master


In order to make syslog communication through TLS work, I followed this procedure  on one node.
I backed up the original cacert.pem and copy the new root certificate just created to $SPLUNK_HOME/etc/auth/cacert.pem
I also copied the server certificate to $SPLUNK_HOME/etc/auth/server.pem and change the configuration in files $SPLUNK_HOME/etc/apps/launcher/local/inputs.conf and $SPLUNK_HOME/etc/system/local/server.conf

Since then, I have the error log :
ERROR LMTracker - failed to send rows, reason='Unable to connect to license master=https://xxx:8089 Error connecting: SSL not configured on client'
(xxx correspond to the license master server)

So I tried to restore original cacert.pem and server.pem but i still get the error.
I tried to connect to the license master through TLS with curl but I get an error (Peer's Certificate has expired)
I checked the license master certificate and it appears to be expired since one month.
But license verification is working from other Splunk nodes (on which I did not change root certificate) and curl too.
Also I am not able to renew this certificate as it is sign by the default root CA and I do not have the passphrase of the private key.

The connection to the web interface of this node does not work, I get an internal server error.

Could you please help me to figure out what is blocking the license verification?

Do not hesitate to tell me if you need more details.

Thank you

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