Outlook disconnecting from Exchange Server

[Jim]

Periodically, perhaps once a week, perhaps 4 or 5 times
per day, a message pops up on user's screen that outlook
has disconnected from server. While this causes no problem
with standard MS applications it is causing havoc with our
accounting system which runs on a Pervasive database. Once
connection from the server has been lost, it cannot be
reconnected, causing lost data, record locks etc. Excerpt
from application error log below -
Please note that the user did not cancel or attempt to
cancel any process/procedure/application.
No errors are being recorded in server logs during these
periods.
Outlook is 2003, Exchange Server - SBS 2000, Client O/S -
XP Pro
Server - Compaq Proliant ML370
Clients - Dell Optiplex GX270

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 19
Date: 16/02/2004
Time: 10:27:07
User: N/A
Computer: QPLxxx
Description:
Rpc call (EcDoRpc) to server (server-name) failed with
error code (6be) after waiting (25329) ms; eeInfo (none).

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 19
Date: 16/02/2004
Time: 10:27:12
User: N/A
Computer: QPLxxx
Description:
Rpc call (EcDoDisconnect) to server (server-name) failed
with error code (5b4) after waiting (5000) ms; eeInfo
(none).

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:


Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 19
Date: 16/02/2004
Time: 10:27:17
User: N/A
Computer: QPLxxx
Description:
Rpc call (BindingFree) to server (server-name) failed with
error code (5b4) after waiting (5000) ms; eeInfo (none).

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 17
Date: 16/02/2004
Time: 10:27:19
User: N/A
Computer: QPLOCDG3KZY0J
Description:
User canceled request against server (server-name) after
waiting (37125) ms.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 17
Date: 16/02/2004
Time: 10:27:19
User: N/A
Computer: QPLxxx
Description:
User canceled request against server (server-name) after
waiting (11687) ms.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 26
Date: 16/02/2004
Time: 10:27:19
User: N/A
Computer: QPLxxx
Description:
Connection to the Microsoft Exchange Server has been lost.
Outlook will restore the connection when possible.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 26
Date: 16/02/2004
Time: 10:27:48
User: N/A
Computer: QPLxxx
Description:
Connection to the Microsoft Exchange Server has been
restored.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.