A co-worker suddenly says she can't log in

I tried to set a password, but the following error occurs. (Colleagues have administrator rights)

I got that error and checked the logs, but I'm not sure what to do.
```
2020-09-18 22:39:39,714 WARN [http-nio-9002-exec-1] [confluence.user.actions.SetUserPasswordAction] doSet Failed to update user password. Cause: ConnectException: Connection refused (Connection refused)
-- referer: http://admin.moderntec.kr:9002/admin/users/setuserpassword.action?username=summit1126 | url: /admin/users/dosetuserpassword.action | traceId: 90154267270cab1d | userName: HoYoung | action: dosetuserpassword
2020-09-18 22:39:39,716 WARN [http-nio-9002-exec-1] [confluence.impl.hibernate.ConfluenceHibernateTransactionManager] doRollback Performing rollback. Transactions:
->[null]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT (Session #1603804403)
-- referer: http://admin.moderntec.kr:9002/admin/users/setuserpassword.action?username=summit1126 | url: /admin/users/dosetuserpassword.action | traceId: 90154267270cab1d | userName: HoYoung | action: dosetuserpassword
```