Signed plug-ins

Your administrator may have selected plug-ins to be installed automatically with your client software. These plug-ins are signed with a certificate that is trusted by your client, and verified that the data they contain is not corrupted. Plug-ins signed in this way can then be installed without having to prompt you to accept them.

Occasionally, a plug-in is found to have a problem. Either it is unsigned, not signed with a trusted certificate, or has somehow become corrupted. If there is a problem with a plug-in, you will be prompted with an error message to take certain actions.

Table 1. Plug-in error messages
If you get this error message	Options
The following plug-in cannot be installed or updated due to an invalid signature. An invalid signature indicates that the code has been corrupted.	You cannot install the plug-in. Instead, report the problem to your administrator.
The following plug-in has a certificate that is not yet valid. It will become valid on <date>.	Do not install this plug-in (default) Install this plug-in Install the plug-in and add the signer to my list of trusted signers.
The following plug-in has a certificate that has expired.	Do not install this plug-in (default) Install this plug-in. Install the plug-in and add the signer to my list of trusted signers.
The following plug-in in not signed. This means that you cannot be sure of the origin of the code. Installing or updating unsigned code exposes your system to risk.	Do not install this plug-in (default) Install this plug-in. Note: Because the plug-in is not signed, you do not have the option of adding the signer to your list of trusted signers.
The following plug-in is signed by an entity that you do not have listed as trusted. Installing or updating code from a source of unknown trust exposes your system to risk.	Do not install this plug-in (default) Install this plug-in Install the plug-in and add the signer to my list of trusted signers.

If you get an error message, it is generally advisable to contact your administrator to determine the best course of action, especially if you still have the option of installing the plug-in and adding the signer to your list of trusted signers. Depending on the nature of the problem that generated the error message, you may need to provide additional information about the plug-in and the certificate with which it was signed to your administrator. Click View Certificate to see information about the certificate with which the plug-in was signed.

The error message provides the following information about the plug-in:

Plug-in name
The feature functionality it provides to the client
Plug-in file name
The signature on the plug-in. Normally, this is the name of the Internet certificate.
Date on which the plug-in was signed, if plug-in is time-stamped.