>Mestinya cukup dengan IMAP session connection 100-an.
>Coba periksa ke BIS log, apakah ada petunjuk (error) disitu?

Seteleah saya periksa lebih lanjut, pada jam2 kejadian tersebut tadi jam 11 ada 
tanda2 sebagai berikut

----------
Thu 2011-10-27 11:15:35: Sending notification to BlackBerry Internet Service...
Thu 2011-10-27 11:15:35: *  Notification: NEW MAIL
Thu 2011-10-27 11:15:35: *  Account: sthad...@mscid.com
Thu 2011-10-27 11:15:35: *  Subscription-ID: 7961000005
Thu 2011-10-27 11:15:35: *  URL: 
https://notify1.bis3.ap.blackberry.com/events?ipc=200&ipa=2006
Thu 2011-10-27 11:15:35: *  Port: 443
Thu 2011-10-27 11:15:35: *  Headers sent:
Thu 2011-10-27 11:15:35: *      X-Notification-Info: 
it+hVsAVerFqR+MUDNgc3VNKCbqLzoqf9k2NbnaQ3tzoF7VbaL+tufqsUkUbPNZ52CBtgvgxOv4tznx2R/nh25EXWQatuLbfcKcr2CbZ2qd/jeXpMjh6fcmeEW6z83kELuoT0NHJpOexotR3xlKsj7/Iqs2AeikBernMSQuTqz0V3uwVpC+dPgClZAlllY+r
Thu 2011-10-27 11:15:35: *      X-Subscription-Id: 7961000005
Thu 2011-10-27 11:15:35: *      Content-Length: 0
Thu 2011-10-27 11:15:35: *  Result: HttpSendRequestEx failed (Error 12029)
Thu 2011-10-27 11:15:35: ----------
Thu 2011-10-27 11:15:56: Sending notification to BlackBerry Internet Service...
Thu 2011-10-27 11:15:56: *  Notification: NEW MAIL
Thu 2011-10-27 11:15:56: *  Account: atjokroneg...@mscid.com
Thu 2011-10-27 11:15:56: *  Subscription-ID: 7962000014
Thu 2011-10-27 11:15:56: *  URL: 
https://notify1.bis3.ap.blackberry.com/events?ipc=200&ipa=2006
Thu 2011-10-27 11:15:56: *  Port: 443
Thu 2011-10-27 11:15:56: *  Headers sent:
Thu 2011-10-27 11:15:56: *      X-Notification-Info: 
it+hVsAVerFqR+MUDNgc3RfhOujmz5l65liB/t4/ej4cEJH56RXNWG5WX7gOxqtq2CBtgvgxOv7HG6bPeDgntpEXWQatuLbfcKcr2CbZ2qcsSlavkt9Qa7JScQynqX6ceA603iSthScgs3dbErjFPHCQbUL9Md8M1CY02Lvy4ioNJpc+FdKUZb5UYwfsuTAxEONWaN3mo/E=
Thu 2011-10-27 11:15:56: *      X-Subscription-Id: 7962000014
Thu 2011-10-27 11:15:56: *      Content-Length: 0
Thu 2011-10-27 11:15:56: *  Result: HttpSendRequestEx failed (Error 12029)
Thu 2011-10-27 11:15:56: ----------
Thu 2011-10-27 11:16:17: Sending notification to BlackBerry Internet Service...
Thu 2011-10-27 11:16:17: *  Notification: NEW MAIL
Thu 2011-10-27 11:16:17: *  Account: atjokroneg...@mscid.com
Thu 2011-10-27 11:16:17: *  Subscription-ID: 7962000014
Thu 2011-10-27 11:16:17: *  URL: 
https://notify1.bis3.ap.blackberry.com/events?ipc=200&ipa=2006
Thu 2011-10-27 11:16:17: *  Port: 443
Thu 2011-10-27 11:16:17: *  Headers sent:
Thu 2011-10-27 11:16:17: *      X-Notification-Info: 
it+hVsAVerFqR+MUDNgc3RfhOujmz5l65liB/t4/ej4cEJH56RXNWG5WX7gOxqtq2CBtgvgxOv7HG6bPeDgntpEXWQatuLbfcKcr2CbZ2qcsSlavkt9Qa7JScQynqX6ceA603iSthScgs3dbErjFPHCQbUL9Md8M1CY02Lvy4ioNJpc+FdKUZb5UYwfsuTAxEONWaN3mo/E=
Thu 2011-10-27 11:16:17: *      X-Subscription-Id: 7962000014
Thu 2011-10-27 11:16:17: *      Content-Length: 0
Thu 2011-10-27 11:16:17: *  Result: HttpSendRequestEx failed (Error 12029)
Thu 2011-10-27 11:16:17: ----------
Thu 2011-10-27 11:16:38: Sending notification to BlackBerry Internet Service...
Thu 2011-10-27 11:16:38: *  Notification: NEW MAIL
Thu 2011-10-27 11:16:38: *  Account: hkoea...@mscid.com
Thu 2011-10-27 11:16:38: *  Subscription-ID: 7962000012
Thu 2011-10-27 11:16:38: *  URL: 
https://notify2.bis3.ap.blackberry.com/events?ipc=200&ipa=2006
Thu 2011-10-27 11:16:38: *  Port: 443
Thu 2011-10-27 11:16:38: *  Headers sent:
Thu 2011-10-27 11:16:38: *      X-Notification-Info: 
it+hVsAVerFqR+MUDNgc3WWeIZ4gmfnkuT70oFxX/AMcEJH56RXNWOoLYSwTo4werQteL/i2iLKjNoBGyxhgN5EXWQatuLbfqIsjZJ2Tc9Mykho8bCKAoL7AFx9uqzFIP8hgpEcuP0yxotR3xlKsj7/Iqs2AeikBernMSQuTqz0V3uwVpC+dPgClZAlllY+r
Thu 2011-10-27 11:16:38: *      X-Subscription-Id: 7962000012
Thu 2011-10-27 11:16:38: *      Content-Length: 0
Thu 2011-10-27 11:16:38: *  Result: HttpSendRequestEx failed (Error 12029)
Thu 2011-10-27 11:16:38: ----------
Thu 2011-10-27 11:16:59: Sending notification to BlackBerry Internet Service...
Thu 2011-10-27 11:16:59: *  Notification: NEW MAIL
Thu 2011-10-27 11:16:59: *  Account: dbarl...@mscid.com
Thu 2011-10-27 11:16:59: *  Subscription-ID: 7962000009
Thu 2011-10-27 11:16:59: *  URL: 
https://notify2.bis3.ap.blackberry.com/events?ipc=200&ipa=2006
Thu 2011-10-27 11:16:59: *  Port: 443
Thu 2011-10-27 11:16:59: *  Headers sent:
Thu 2011-10-27 11:16:59: *      X-Notification-Info: 
it+hVsAVerFqR+MUDNgc3TTlzotoUoTgw7nyBpWNmP3BGw40//UrK/v+9lis2sIXBZ9XLOJA/mQPL3yFzBe3FCsyTDpfepxOwvpF7XIwWqLR/fgPEH/mbOfxP7oQRuSenUtzu6ITP7Sga4a/UMfIwwr9qnAvEAZnTowqs+fWttAkno+a3hDf/4cXqkuZeA379yjY5dzvfXc=
Thu 2011-10-27 11:16:59: *      X-Subscription-Id: 7962000009
Thu 2011-10-27 11:16:59: *      Content-Length: 0
Thu 2011-10-27 11:16:59: *  Result: HttpSendRequestEx failed (Error 12029)
----------

Mungkin inilah tanda yang menandakan email blackberry tidak bisa masuk, jika 
benar, mohon pencerahannya om.

Regards,
Hidayat


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