You encounter connectivity issues when you use Outlook 98, Outlook 2000, and Outlook 2002| Article ID | : | 320843 | | Last Review | : | January 7, 2006 | | Revision | : | 3.3 |
This article was previously published under Q320843 NOTE: The procedures in this article only apply if you have installed
Outlook with the Corporate or Workgroup option. With this option, you can use
Messaging Application Programming Interface (MAPI) services. To determine your
installation type, click About Microsoft Outlook on the Help menu. If you have the Corporate or Workgroup installation, you
see "Corporate or Workgroup".
SYMPTOMS While you use Outlook, one or more of the following
behaviors may occur:
| • | Outlook is very slow. | | • | You cannot open attachments. | | • | You cannot open e-mail, even though you can log
on. | | • | Outlook stops responding, or "hangs." |
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CAUSE These issues may occur if one or more of the following
conditions are true:
| • | There are TCP/IP stack issues on the Outlook client
computer or the Microsoft Exchange Server computer. | | • | There are hardware issues with network devices--for
example, faulty cables or connections, incorrect software configuration, or a
device that may require a driver or firmware upgrade. Network devices that may
be causing the issue include the following:
| • | The network interface card (NIC) on the Outlook client
computer | | • | The NIC on the Exchange Server computer | | • | A network switch | | • | A network router | | • | A network firewall |
| | • | A driver or firmware upgrade is not compatible with your
version of Outlook. | | • | There is a problem with the Maximum Transmission Unit size
settings in Microsoft Windows 2000 Service Pack 2 (SP2). For more information
about how to troubleshoot this issue, see the "Resolution" section of this
article. |
Back to the top RESOLUTION To resolve these issues, try to determine if only one, only
some, or all Outlook clients are experiencing the symptoms.
| • | If some but not all clients are affected, a common network
connection that is affecting only part of the network may be the source of the
problem. To resolve this issue, try the following methods:
| • | Look for bad cables or connections. | | • | See if driver or firmware updates are available for
routers, switches, or firewalls on the network. |
| | • | If only one client is affected, TCP/IP or the NIC on the
client computer may be the source of the problem. To resolve this issue, try
the following methods:
| • | Determine if a TCP/IP issue is the cause. For
information about how to do this, see the "More
Information" section later in this article. | | • | Reinstall the TCP/IP protocol. | | • | Update the NIC drivers. | | • | Replace the NIC. |
| | • | If all clients are affected, TCP/IP or the NIC on the
Exchange Server computer may be the source of the issue. To resolve this issue,
try the following methods:
| • | Determine if a TCP/IP issue is the cause. For
information about how to do this, see the "More
Information" section later in this article. | | • | Reinstall the TCP/IP protocol. | | • | Update the NIC drivers. | | • | Replace the NIC. |
| | • | Determine if the Maximum Transmission Unit size settings in
Windows 2000 SP2 is the cause.
For additional information about this issue, click the following article numbers to view the articles in the Microsoft Knowledge Base:
301337 (http://support.microsoft.com/kb/301337/)
PMTU detection may not work after
you install Windows 2000 Ss
301117 (http://support.microsoft.com/kb/301117/) Slow
performance transferring large data blocks with RPC
120642 (http://support.microsoft.com/kb/120642/) TCP/IP and
NBT configuration parameters for Windows 2000 or Windows NT
| | • | If a driver or firmware upgrade is not compatible with your
version of Outlook, go back to an earlier version of the driver or
firmware. |
Back to the top MORE INFORMATION
For additional information about how to
troubleshoot TCP/IP connection problems, click the following article numbers to view the articles in the Microsoft Knowledge Base:
169790 (http://support.microsoft.com/kb/169790/)
How to troubleshoot Basic TCP/IP problems
102908 (http://support.microsoft.com/kb/102908/) How to
troubleshoot TCP/IP connectivity with Windows 2000 or Window NT
314067 (http://support.microsoft.com/kb/314067/) How to
troubleshoot TCP/IP Connectivity with Windows XP
162326 (http://support.microsoft.com/kb/162326/) Using
TRACERT to troubleshoot TCP/IP problems in Windows 2000 and Windows
NT
314868 (http://support.microsoft.com/kb/314868/) Using
TRACERT to troubleshoot TCP/IP problems in Windows XP
299451 (http://support.microsoft.com/kb/299451/) How to
remove and reinstall TCP/IP on a Windows 2000 domain controller
181599 (http://support.microsoft.com/kb/181599/) How to
remove and reinstall dial-up networking and TCP/IP files
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APPLIES TO| • | Microsoft Outlook 2002 Standard Edition | | • | Microsoft Outlook 2000 Standard Edition | | • | Microsoft Outlook 98 Standard Edition |
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