Have there been any changes made recently in your OBIEE domain?
have you looked at the log files to see if there are any errors logged?
I don't think to change any configuration on the OBIEE domain.
Did you mean on Admin Server logs on following path ".../domains/bi/servers/AdminServer/logs/"?
I would suggest looking at all the logs.
I find out the problem and its a little weird. I enabled SSL port on Weblogic console for "BI Server" and after that, successfully enter to BI Analytics using "HTTPS" protocol. but the problem raises when want to disable the "HTTP" protocol.
After disabling "HTTP" protocol, when I want login to BI Analytics using "HTTPS" it cannot Sign in and display the following message "The specified credentials could not be authenticated" and I don't understand why this error occurs.
also, I checked log files and have some error about "<Connection error: x.x.x.x:7001.>". "7001" is a port that I assign for "HTTPS" protocol.
First of all, are you aware that version 188.8.131.52.0 has reached the end of correction support (Oracle Business Intelligence Enterprise Edition (OBIEE) Error Correction Support (Doc ID 1664916.1))?
Being that said, did you configure the ldap.url propperty to use LDAPS (Configuring Internal WebLogic Server LDAP to Use LDAPs)?
as I said in above, that doesn't have any configuration for LDAP!!
It does, as stated in the Security Guide
1) Login to EM
2) Go to Weblogic Domain->Security->Security Provider Configuration
3) Expand Security Provider->Identity Store Provider
4) Click on Configure
5) Click on Add
6) Select "ldap.url" on Property Name
7) For the value, add "ldaps://<host>:<adminServer HTTPS port>"
8) Click OK twice
9) Restart the services