The list of the X509 certificates of the CA (Certificate Authorities) trusted by the XtremWeb-HEP server installed at LAL is available in an archive file.
This archive file (which contains CA public keys only), is updated every night at 00:00.
From time to time, you may have a error message regarding expiration date and/or defective credential.
This kind of error is normal and occurs each time CA list is updated.
You just have to update (download again) this archive file.
These certificates can be used with jlite by Oleg Sukhoroslov to generate your X509 proxy.