"the provider did not return a providermanifesttoken" using Oracle MangedDataAccess with EF 6 Code First

Question

I have an web application that was using oracle 11g, EF 5 code first and system.data.oracleclient.

So now, It was upgraded to EF 6 and Oracle Managed Data Access.

The ODP .Net is installed. This error happens only when I am using TNS in connection string. If I write the full connection string, with TNS, it works fine.

My connection string is:

<add name="CoreDbContext" connectionString="data source=DBCONN;password=TIS;user id=TIS" providerName="Oracle.ManagedDataAccess.Client"/>

What is wrong?

Answer 1

Basically, I have reinstalled the Oracle data provider and it worked fine.