A variation of that problem (might raise new ticket if it feels too different;-) prevents us from using the new JIRA system with Mylyn behind company firewall.
The offline JIRA connector archive (3.2.2 for Eclipse 3.7+ and JIRA 5+, the error also happens with 3.5 or 3.6 files) cannot be installed as it fails with the following error:
Sorry this isn't an answer, but hopefully if someone has an answer it may cover both Online and Offline installations of JIRA connect...
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