DevOps, CI/CD and Automation

I installed Oracle 11g ODAC 11.1.0.6.20 and ran it in test with no problems. Go to Production and now I'm seeing this intermittent error show up. It only shows up the first time a user attempts to login. It works fine on reattempt and they can browse the web app with no issues. If they log off attempt to login an hour later, the ORA-12571 will reappear. Reattempt and everything is fine.

The database is Oracle 10gR2 RAC. Any ideas??

Webserver Event Log:

Exception information:
Exception type: OracleException
Exception message: ORA-12571: TNS:packet writer failure

Thread information:
Thread ID: 9
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure)
at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, OracleConnection conn, String procedure, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
at Oracle.Web.Security.OracleMembershipProvider.GetPasswordWithFormat(String username, Boolean updateLastLoginActivityDate, Int32& status, String& password, Int32& passwordFormat, String& passwordSalt, Int32& failedPasswordAttemptCount, Int32& failedPasswordAnswerAttemptCount, Boolean& isApproved, DateTime& lastLoginDate, DateTime& lastActivityDate)
at Oracle.Web.Security.OracleMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved, String& salt, Int32& passwordFormat)
at Oracle.Web.Security.OracleMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved)
at Oracle.Web.Security.OracleMembershipProvider.ValidateUser(String username, String password)
at System.Web.Security.Membership.ValidateUser(String username, String password)
at Login.LoginUser_Authenticate(Object sender, AuthenticateEventArgs e) in d:\InetPub\WWWRoot\supplierportal\Login.aspx.cs:line 27
at System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e)
at System.Web.UI.WebControls.Login.AttemptLogin()
at System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e)
at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
at System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e)
at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)