system.timers.timer doesn't fire the elapsed event on the server

I have a Web Service and i used timers inside it. when i run the service application inside my vs2010 it work's like a charm. but when i deploy it to the remote server it doesn't fire the ElapsedEventHandler. I used a Logger to log the events and i set the permissions for write into the log file. Let me explain more. I'm trying to write a service which waits for a job, and the job is sending email to a big list. and emails should be send by 20 secs interval. here is some part of my code:

public class EmailSender : IEmailSender
{

    Queue<AdvEmail> ListOfEmails = new Queue<AdvEmail>();
    List<EmailJob> EmailJobs = new List<EmailJob>();

    Timer timerFetchJobs = null;
    Timer timerSendEmails = null;

    public EmailSender()
    {
        try
        {
            Logger.Log("init service");
            timerFetchJobs = new Timer();
            timerFetchJobs.Interval = 5 * 1000;
            timerFetchJobs.Elapsed += new ElapsedEventHandler(timerFetchJobs_Elapsed);
            timerFetchJobs.Enabled = true;
            timerSendEmails = new Timer();
            timerSendEmails.Interval = 20 * 1000;
            timerSendEmails.Elapsed += new ElapsedEventHandler(timerSendEmails_Elapsed);
            timerSendEmails.Enabled = true;
            timerFetchJobs.Start();
            timerSendEmails.Start();
            Logger.Log("init service Ended Succefully");
            Logger.Log("timerFetchJobs.Enabled=" + timerFetchJobs.Enabled.ToString());
            Logger.Log("timerSendEmails.Enabled=" + timerSendEmails.Enabled.ToString());
        }
        catch (Exception ex)
        {
            Logger.Log("Error in InitService. Message: " + ex.Message);
        }
    }

    void timerSendEmails_Elapsed(object sender, ElapsedEventArgs e)
    {
        timerSendEmails.Stop();
        Logger.Log("Checking for Emails in the Queue");
        // some statments here

        timerSendEmails.Start();
    }

    void timerFetchJobs_Elapsed(object sender, ElapsedEventArgs e)
    {
        timerFetchJobs.Stop();
        try
        {
            FetchJobsFromDB();
        }
        catch (Exception ex)
        {
            Logger.Log("Error in timerFetchJobs. Message: " + ex.Message);
        }
        timerFetchJobs.Start();
    }

when i go to the service addreess from browser, it initializes and logs the init level correctly, but no clue of firing timers!! which i dont know why?? what I'm doing wrong? thanks

Edit: here is the log file when i run it locally:

Log Entry : 1392/01/30 08:47:09 : :init service-------------------------------

Log Entry : 1392/01/30 08:47:09 : :init service Ended Succefully-------------------------------

Log Entry : 1392/01/30 08:47:09 : :timerFetchJobs.Enabled=True-------------------------------

Log Entry : 1392/01/30 08:47:09 : :timerSendEmails.Enabled=True-------------------------------

Log Entry : 1392/01/30 08:47:14 : :Checking for Jobs in the Database-------------------------------

Log Entry : 1392/01/30 08:47:16 : :There is a new job. job name is Pad 71-------------------------------

Log Entry : 1392/01/30 08:47:19 : :Adding Emails for th job Pad 71-------------------------------

And here is the log file when i deploy it to remote server

Log Entry : 1392/01/30 08:47:09 : :init service-------------------------------

Log Entry : 1392/01/30 08:47:09 : :init service Ended Succefully-------------------------------

Log Entry : 1392/01/30 08:47:09 : :timerFetchJobs.Enabled=True-------------------------------

Log Entry : 1392/01/30 08:47:09 : :timerSendEmails.Enabled=True-------------------------------

Tags: C# (C# 4.0), Visual Studio (Visual Studio 2010), Webservice