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Problem

You may encounter the folowing error:

"There is a problem with the proxy server's security certificate"

When Microsoft Office Outlook 2007 tries to connect to a server by using a remote procedure call (RPC) connection or a secure HTTP (HTTPS) connection, you receive one of the following error messages:

1. There is a problem with the proxy server's security certificate, %s. Outlook is unable to connect to this server.

2. There is a problem with the proxy server's security certificate, %s. The name on the security certificate is invalid or does not match the name of the site. Outlook is unable to connect to this server. 

3. There is a problem with the proxy server's security certificate, %s. The security certificate is not from a trusted certifying authority. Outlook is unable to connect to this server. 

Notes:
- The placeholder is the Outlook profile property 001f6622. This is the Microsoft Exchange Server RPC proxy server name.
- The placeholder is the error code.

For 1 and 2, the error code that is returned is the sum of all the bitmask certificate problem codes. See the "More Information" section for information about the bitmask certificate problem codes. 

For 3, the error code is expected to always be 0x00000008.
The error "There is a problem with the proxy server's security certificate" appears when Outlook 2007 tries to connect to a server by using an RPC connection or an HTTPS connection



Cause

You can see these error messages when one of the following error messages is true:

  - The connection to the server requires a certification authority (CA).

  - You have not trusted the certification authority at the root.

  - The certificate is invalid or revoked.

  - The certificate does not match the name of the site.



Resolution

Use one of the following methods, the most appropriate for your situation.


Method 1:
Examine the certificate (Use this method if you see either error 1 or 2)

Examine the certificate. Then, contact your system administrator to resolve this issue.

To examine the certificate, follow these steps:

1. Connect to the RPC server or to the secure server in Microsoft IE. For example, type https://www.server_name.com/rpc in the Address bar of the Web browser and then press ENTER. Note: The server_name placeholder references the RPC server name or the secure server name.

2. Then double-click the padlock icon located in the lower-right corner of the Web browser.                                                                             

3. Click the Details tab.

4. Note the information in the following fields
              - Valid to:  The Valid to field indicates the date until which the certificate is valid.
              - Subject:  The data in the Subject field should match the site name. 


Method 2:
Install the trusted root certificate (Use this method if you see error 3)

Please follow these steps to install the trusted root certificate:

1. Click Install Certificate when you are prompted with the Certificate dialog box then click Next.

2. Select the Place all certificate in the following store check box and Browse.

3. Click Trusted Root Certification Authorities and click OK.

4. Click Next, then Finish and OK.

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