Client must be authenticated to access this resource

[CST JIRA Confluence Admin]

Groovy Script to run select query to an external db from Script Console is showing error as below

Client must be authenticated to access this resource

Although db login credentials are provided in the script

On the Jira server, via sql studio able to login to this external db schema using same credentials.

But still there seems to be this error is caused by some access issue

[Nic Brough -Adaptavist-]

That looks like an error in JIRA, rather than your script.  It suggests your admin access to the console script has timed out or ended before the script is finishing.

[CST JIRA Confluence Admin]

New Error occurring now as below

2017-05-23 10:44:35,621 WARN [common.UserScriptEndpoint]: Script console script failed: 
java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
at Script15.run(Script15.groovy:6)

FYI, sql jar - sqlite-jdbc-3.7.2.jar is contained in below 2 foders, both are same

D:\JIRA\atlassian-jira\WEB-INF\lib
D:\JIRA\lib

Is the jar has to be replaced with -  " sqljdbc4. jar " ?

If yes, where this has to be updated ?

In which Jira config file ?

Appreciate your help.