Login errors for new users

Document ID : KB000103487
Last Modified Date : 27/06/2018
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Issue:
All users, except defaults have issues to login. 

Error: 

Jun 26, 2018 11:57:36 AM VegasSecurityContext logon 
INFO: 40 - User ID <userid> [workspace = 25965] attempting logon with user/pwd, [Originating User: <userid>] 
Jun 26, 2018 11:57:36 AM purescm.vegas.engine.StringEncrypter rsaDecrypt 
SEVERE: 40 - Uncaught exception: Decryption error 
purescm.vegas.engine.exceptions.EncryptionException: Decryption error 
at purescm.vegas.engine.StringEncrypter.rsaDecrypt(StringEncrypter.java:243) 
at purescm.vegas.engine.SecurityDAOSqlServerImpl.logon(SecurityDAOSqlServerImpl.java:194) 
at ... 

We were using ldap integration but due to this error we already disabled it. Nevertheless error remains. 
Environment:
CA ALC 3.x, all platforms
Cause:
Root cause was not found.
Resolution:
As a workaround we disabled LDAP authentication and all the users reset their passwords. Users can all login again, so problem is resolved.