Windows server 2012R2 Classic ASP Microsoft OLE DB Provider for SQL Server error '80040e4d'

I have a classic ASP application which has been moved to windows server 2012R2 two days before and sice then its showing a connection error in some sections of the application.

Microsoft OLE DB Provider for SQL Server error '80040e4d' Login failed for user 'sa'.

Login and some listing functionality are working fine but when Im accessing a billing page its showing the above mentioned error and we are using the same DB connection in the billing page also.

Following is the connection string used

Dim datasource,cnnCompanyDbase
Set cnnCompanyDbase=Server.CreateObject("ADODB.Connection")
cnnCompanyDbase.Open "Provider=SQLOLEDB;Initial Catalog=CompanyDatabase;Data Source=192.168.0.20;User Id=sa; Password=satest;"

Previously the application was running fine on windows server 2003.