The MyProxy is an online credential repository that provides secure and convenient storage for grid security credentials.

MyProxy is mature, open source software for the Globus Toolkit that has been used by the grid community for over four years, in projects such as NEESgrid, TeraGrid, EU DataGrid, and the NASA Information Power Grid. MyProxy is included in the NSF Middleware Initiative GRIDS Center software distribution and is included in the Globus Toolkit 4.0 release.

MyProxy allows users to easily obtain a proxy credential from the repository, without requiring users to manage private key and certificate files. Grid portals use MyProxy to obtain proxy credentials, so users can access secure grid resources via the portal interface. Job management software, such as Condor-G, uses MyProxy to renew credentials for long-running jobs. MyProxy can also be integrated with CA software, such as the Globus Simple CA, to ease credential distribution.

A well-managed MyProxy repository can provide better security for user private keys when compared to the typical solution of storing keys on end-user desktop systems. MyProxy can enforce policies on the passphrases used to protect user keys and can provide the ability to monitor key usage to detect or track misuse. MyProxy can also be integrated with local site authentication systems, such as Kerberos and one-time passwords, to bridge between local site security and grid security.

If you install your Terradue's certificate in your favorite browser you can be automatically recognized by the Terradue's Portal, Trac and svn. For this, you just have to install your personal Terradue's certificate in your favorite Internet browser and present it when logging in.
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The open source Globus Toolkit is a fundamental enabling technology for the "Grid," letting people share computing power, databases, and other tools securely online across corporate, institutional, and geographic boundaries without sacrificing local autonomy. The toolkit includes software services and lib [...]

The primary motivations behind the Grid Security Infrastructure are:

• The need for secure communication (authenticated and perhaps confidential) between elements of a computational Grid.
• The need to support security across organizational boundaries, thus prohib [...]

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Please contact Terradue's Certificate Authority (ca at terradue.com) stating the project or collaboration you are involved, what are the current components that you need to use and your contact details. Generally generating new certificate takes some working days for identity confirmatio [...]

It clearly means that your proxy certificate is expired :)

Proxies are certificates signed by the user, or by another proxy, that do not require a password to submit a GRID job. They are intended for short-term use, when the user is submitting many jobs to the GRID and [...]