Symptoms

The following JavaScript error appears in the Chrome Console via Developer Tools.

[blocked] The page at 'https://your_jira_domain_name.com/plugins/servlet/gadgets/ifr?container=atlas…t%2Fgadgets%2Factivitystream-gadget.xml&libs=auth-refresh#rpctoken=4396290' was loaded over HTTPS, but ran insecure content from 'http://destination_jira_domain_name.com/s/en_USw75y1c-418945332/853/39/5.x.x/_/download/bat…ams:streamsGadgetResources/com.atlassian.streams:streamsGadgetResources.js': this content should also be loaded over HTTPS.

Diagnosis

If your JIRA is running with SSL and add other JIRA instance gadgets via 'Add Gadgets' > 'Gadget Subscriptions' > 'Add Subscription'. But, you see the gadget showing empty data.

Cause

Browser has some feature blocking un-trusted content or page. 

Workaround

Firefox

1. Open about:config in FireFox
2. Search for the security.mixed_content.block_active_content variable
3. Change the value from true to false

Chrome

1. Select the gray shield that appears on the right side of URL bar
2. Click it and select "Load anyway"