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This is discussed in detail here: SocketPermission error
The short answer is that this appears to be a compatibility issue with Java 6 and Firefox, and it only affects some servers. Sun does have this bug listed in their knowledge base, but until Java or Firefox is updated, there's not really anything that can be done.
All other browsers I've tried work fine, though.
When trying to submit a picture, I get this message : access denied (java.net Socket Permission 69.89.20.45:80 connect resolve) SendE
Is the problem coming from the board or from my java or something else?