If you want to connect to citrix from outisde the office through your firewall then the citrix server needs configuring for an alternate connection. Here is a guide on how to setup citrix for external connections.
When launching OWA 2010 in Exchange 2010 you see the error Outlook Web App didn’t initialize. If the problem continues, please contact your helpdesk.
Couldn’t find a base theme (folder name=base) . This can be fixed with a power shell command