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Error while using Logics SMPP APIs

HI,
I am using Logica SMPP APIs to connect to a SMSC for sending and receiving SMS.
I am using JDK 1.6 and Apache Tomcat 6.
The web application is being deployed in Windows Server 2003.

After running the application for couple of days, when I try to send a message, I am getting this error :

java.io.IOException: Not connected
      at com.logica.smpp.TCPIPConnection.send(TCPIPConnection.java:344)
      at com.logica.smpp.Transmitter.send(Transmitter.java:69)
      at com.logica.smpp.Session.send(Session.java:931)
      at com.logica.smpp.Session.send(Session.java:984)
      at com.logica.smpp.Session.submit(Session.java:585)
      at com.san.sms.smpp.SMPPMessaging.submitRequest(SMPPMessaging.java:777)
      at com.san.sms.smpp.SMPPMessaging.submitTextMessage(SMPPMessaging.java:403)
      at com.san.sms.smpp.SMPPMessaging.handleMessage(SMPPMessaging.java:314)
      at com.san.sms.smpp.SMPPMessaging.access$2(SMPPMessaging.java:310)
      at com.san.sms.smpp.SMPPMessaging$MessageQueListener.run(SMPPMessaging.java:258)

I think it is getting unbound. But I am neither sending any unbind requests nor the SMSC.
What might be the problem.
Is it an OS related issue or network related issue.

Thanks.

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d_techguy

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sandeep1984

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Thanks for the reply.

It might not be because, I am sending Enquirelink request every 5 minutes & getting proper response.
What might be the problem then??