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Graham ReidGraham Reid 

Lightning Out wont load lightning.out.js javascript

Im trying to get a Lightning Out component surfaced in an external heroku app.

The heroku page includes lightning.out.js
<script src="https://xxxx.my.salesforce.com/lightning/lightning.out.js?v=2"></script>

but in chrome this fails to load:
Failed to load resource: net::ERR_TUNNEL_CONNECTION_FAILED

I think this is something to do with my companies proxy / network config as the page will work fine when loaded outside of that network.
Any ideas on what steps are needed to solve?  Is this solvable from my end or do I need to get network folks involved?

Thanks