For tests jobs in automation to meet the visibility policy (https://wiki.mozilla.org/Sheriffing/Job_Visibility_Policy), they must not make external connections. Bug 1039019 is trying to enable MOZ_DISABLE_NONLOCAL_CONNECTIONS for B2G mochitests (carrying on the work started in bug 995417), however I'm seeing the following attempted connections intermittently during B2G mochitests: dynamicua.cdn.mozilla.net (93.184.215.191) https://tbpl.mozilla.org/php/getParsedLog.php?id=45847614&tree=Try#error4 07:54:06 INFO - 08-13 14:48:00.376 I/Gecko ( 44): 1407941280379 Marionette INFO sendToClient: {"from":"0","ok":true}, {1831f278-c04a-4dfb-a69a-981b152b1fd7}, {1831f278-c04a-4dfb-a69a-981b152b1fd7} 07:54:06 INFO - 08-13 14:48:13.386 I/Gecko ( 44): --DOMWINDOW == 7 (0x49aa38e0) [pid = 44] [serial = 4] [outer = 0x449b5e20] [url = about:blank] 07:54:06 INFO - 08-13 14:48:14.967 I/Gecko ( 44): [44] WARNING: NS_ENSURE_SUCCESS(rv, rv) failed with result 0x80520012: file ../../../../gecko/content/base/src/nsScriptLoader.cpp, line 381 07:54:06 INFO - 08-13 14:48:17.236 I/Gecko ( 44): *** UTM:SVC TimerManager:notify - notified timerID: user-agent-updates-timer 07:54:06 INFO - 08-13 14:48:17.236 E/GeckoConsole( 44): UTM:SVC TimerManager:notify - notified timerID: user-agent-updates-timer 07:54:06 INFO - 08-13 14:48:17.246 E/GeckoConsole( 44): [JavaScript Warning: "assignment to undeclared variable lastUpdateTime" {file: "jar:file:///system/b2g/omni.ja!/components/nsUpdateTimerManager.js" line: 239}] 07:54:06 INFO - 08-13 14:48:17.287 I/Gecko ( 44): FATAL ERROR: Non-local network connections are disabled and a connection attempt to dynamicua.cdn.mozilla.net (93.184.215.191) was made. 07:54:06 INFO - 08-13 14:48:17.287 I/Gecko ( 44): You should only access hostnames available via the test networking proxy (if running mochitests) or from a test-specific httpd.js server (if running xpcshell tests). Browser services should be disabled or redirected to a local server. MXR shows: http://mxr.mozilla.org/mozilla-central/search?string=dynamicua.cdn.mozilla.net http://mxr.mozilla.org/mozilla-central/source/b2g/app/b2g.js#854 line 854 -- pref("general.useragent.updates.url", "https://dynamicua.cdn.mozilla.net/0/%APP_ID%"); Then: http://mxr.mozilla.org/mozilla-central/search?string=general.useragent.updates http://mxr.mozilla.org/mozilla-central/source/b2g/app/b2g.js#853 line 853 -- pref("general.useragent.updates.enabled", true); line 854 -- pref("general.useragent.updates.url", "https://dynamicua.cdn.mozilla.net/0/%APP_ID%"); line 855 -- pref("general.useragent.updates.interval", 604800); // 1 week line 856 -- pref("general.useragent.updates.retry", 86400); // 1 day http://mxr.mozilla.org/mozilla-central/source/dom/base/SiteSpecificUserAgent.js#12 line 12 -- const PREF_UPDATE = "general.useragent.updates."; http://mxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/UserAgentUpdates.jsm#43 line 43 -- const PREF_UPDATES = "general.useragent.updates."; http://mxr.mozilla.org/mozilla-central/source/netwerk/test/mochitests/test_user_agent_updates.html?force=1#19 line 19 -- const PREF_UPDATES = "general.useragent.updates."; http://mxr.mozilla.org/mozilla-central/source/testing/profiles/prefs_general.js#185 line 185 -- user_pref("general.useragent.updates.enabled", false); My thoughts: 1) The updates should be disabled, given the entry in prefs_general.js - this should work, so either: a) Somewhere we are not checking that pref before making the request. b) We're racing with the test re-enabling the updates (http://mxr.mozilla.org/mozilla-central/source/netwerk/test/mochitests/test_user_agent_updates.html?force=1#118 and http://mxr.mozilla.org/mozilla-central/source/netwerk/test/mochitests/test_user_agent_updates.html?force=1#176) 2) Failing #1, we could just set the URL in prefs_general.js to localhost like others. 3) We should probably also fix "[JavaScript Warning: "assignment to undeclared variable lastUpdateTime" {file: "jar:file:///system/b2g/omni.ja!/components/nsUpdateTimerManager.js" line: 239}]" in the log excerpt above. Jim, as the author of bug 897221 - would you mind taking a quick look at this and letting me know what you think? :-)

I looked at the code and it looks to check the pref correctly. How is prefs_general.js loaded? The pref is default on for b2g (and only b2g), so if prefs_general.js doesn't get loaded immediately or if the changes get reverted at the end of testing, there will a window where the pref is on (again only on b2g). Since this only seems to affect b2g, it makes me wonder if this is the case.

So if the above is true, I don't think even setting the URL in prefs_general.js will work :(