How to trust a certificate for all users on a citrix server

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http://serverfault.com – We have a problem with a specific website which our staff need to access via Internet Explorer on our Citrix server (running Win2K3). When connecting via SSL (a requirement), the site is inaccessible because the certificate issuer's certificate is not in the Trusted Root Certification Authorities. If I manually import the certificate chain (exported my PC), it works, but I'd rather not do that for each user: Is there a way I can import the certificate for all users? I found this MS KB article which details importing certificates in to the Local Computer store to resolve a different issue; (HowTos)