Database Migration Issue

Database Migration Issue

hi
i have an strange issue while trying to migrateDB from Postgre to MS SQL Server, Certificate for computer template is assigned to sql server default instance and force encryption set to be true. also ran MigrateDB.BAT and filled all fields with relate informations. but i get unable to connect error and in changedbserver.log i get these lines:
[21:00:49:412]|[05-26-2017]|[com.adventnet.passtrix.migration.PMPMigrateDBServer]|[INFO]|[15]: Successfully started PostgreSQL Server|
[21:01:02:224]|[05-26-2017]|[com.adventnet.passtrix.migration.PMPMigrateDBServer]|[INFO]|[15]: Network error IOException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target|

what can i do to resolve this issue ?
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