Hi Abdul,
Open the configtool , under the services of instance checked the values for service com.sap.security.core.ume.service
ume.r3.connection.master.ashost= <ABAP host name>
ume.r3.connection.master.client= <ABAP client number>
ume.r3.connection.master.user = <ABAP communication user (like SAPJSF)>
ume.r3.connection.master.password = <password for SAPJSF>
Also checked the LDAP , if it has been configured.
With Regards
Ashutosh Chaturvedi