If you change the password of the Keystore located under <Spotfire Server Install>\tomcat\certs to something other than the default password "changeit" and also update server.xml with the new password you see the below error in the server.log file

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ERROR 2021-09-08T16:28:49,183+0530 [*Initialization*] security.unitrust.ConnectUnifiedStores: Failed to setup keystore for path C:\tibco\tss\10.10.6\tomcat\certs\keystore_spotfire.jks.
java.io.IOException: Keystore password was incorrect
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Cause -

As the TIBCO Spotfire Server will try to merge all stores into memory and will then use the password in javax.net.ssl.trustStorePassword to load them. So all the stores need to have the same password.
 

This article explains how to change the keystore password from default password "changeit" for HTTPS as well as X.509 client certificates.

All

In order to change the password completely and get rid of those error messages, you would have to add the following parameter

"-Djavax.net.ssl.trustStorePassword="certificate password" " to uiconfig.bat and config.bat files and also in the java options (service.bat) file.
 
After adding the parameter"-Djavax.net.ssl.trustStorePassword="certificate password"
 
The uiconfig.bat (<Spotfire Server Install>\tomcat\spotfire-bin\uiconfig.bat) will look as below
 
start "TSS Configuration UI" "%JAVA_HOME%\bin\javaw" -Xms256m -Xmx4096m --add-opens=java.base/java.nio=ALL-UNNAMED -classpath "%CLASSPATH%" -Dcatalina.base="%TSS_HOME%" -Dlog.dir="%TSS_HOME%\logs" -Dlog4j.configurationFile="%TSS_HOME%\spotfire-config\log4j2-tools.xml" -Djavax.net.ssl.trustStorePassword="Tibco@123" com.spotfire.server.tools.confui.ConfigurationMain %*
 
The config.bat  (<Spotfire Server Install>\tomcat\spotfire-bin\config.bat) will look as below
 
"%JAVA_HOME%\bin\java" -Xms256m -Xmx4096m --add-opens=java.base/java.nio=ALL-UNNAMED -classpath "%CLASSPATH%" -Dcatalina.base="%TSS_HOME%" -Dlog.dir="%TSS_HOME%\logs" -Dlog4j.configurationFile="%TSS_HOME%\spotfire-config\log4j2-tools.xml" -Djavax.net.ssl.trustStorePassword="Tibco@123" com.spotfire.server.config.tool.ConfigApp %*
 
To make the changes in the service.bat file follow the below steps
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1. On the command line, go to the <Spotfire Server Install>/tomcat/bin directory.
2. Enter the following command service.bat remove
3. Then locate the ----JvmOptions and add the following "Djavax.net.ssl.trustStorePassword="certificate password" there
4. Save and close the file.
5. Then enter the following command service.bat install

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After changing the password at all three locations you will also have to change the cacert password and make it the same as the new password otherwise you will get the below error
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ERROR 2021-09-06T20:03:41,640+0530 [*Initialization*] security.unitrust.ConnectUnifiedStores: Could not created unified trust store.
java.security.KeyStoreException: problem accessing trust store
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The following command can be used to change the cacerts password