Getting ORA-01017: invalid username/password error but both username and password is correct.

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.NET-Core

I am using oracle database and getting

invalid username/password

while calling it.
this is my connection string-

"DefaultConnection": "Pooling=false;User Id=username;Password=pass;Data Source=192.168.111.100:1521/userdata;"

What I have tried:

private OracleConnection openConnection()
{
try
{
Connection = new OracleConnection(ConnectionString);
if (Connection.State == ConnectionState.Closed || Connection.State == ConnectionState.Broken)
{
Connection.Open();
}
}
catch (Exception ex)
{
Connection.Close();
}
finally
{
//Connection.Close();
//Connection.Dispose();
//OracleConnection.ClearPool(Connection);
}
return Connection;
}