Plugin update 'Connection failed (Status: 400)'

See if disabling http://i.imgur.com/p037pW2.png helps. Your proxy probably doesn't support HTTPS properly.

still not work

https://imgur.com/a/LzezS 

here is log

------------------------------------------------------------------------------------------

2017-09-28 18:29:44,881 [ 443133] INFO - .ide.plugins.PluginManagerMain -
com.intellij.util.io.HttpRequests$HttpStatusException: Status: 400. Status=400, Url=http://plugins.jetbrains.com/plugins/list/?build=IU-172.4343.14
at com.intellij.util.io.HttpRequests.openConnection(HttpRequests.java:519)
at com.intellij.util.io.HttpRequests.access$300(HttpRequests.java:60)
at com.intellij.util.io.HttpRequests$RequestImpl.getConnection(HttpRequests.java:288)
at com.intellij.ide.plugins.RepositoryHelper$1.process(RepositoryHelper.java:156)
at com.intellij.ide.plugins.RepositoryHelper$1.process(RepositoryHelper.java:149)
at com.intellij.util.io.HttpRequests.lambda$doProcess$0(HttpRequests.java:414)
at com.intellij.util.net.ssl.CertificateManager.runWithUntrustedCertificateStrategy(CertificateManager.java:349)
at com.intellij.util.io.HttpRequests.doProcess(HttpRequests.java:414)
at com.intellij.util.io.HttpRequests.process(HttpRequests.java:394)
at com.intellij.util.io.HttpRequests.access$100(HttpRequests.java:60)
at com.intellij.util.io.HttpRequests$RequestBuilderImpl.connect(HttpRequests.java:262)
at com.intellij.ide.plugins.RepositoryHelper.loadPlugins(RepositoryHelper.java:149)
at com.intellij.ide.plugins.RepositoryHelper.loadPlugins(RepositoryHelper.java:104)
at com.intellij.ide.plugins.RepositoryHelper.loadPlugins(RepositoryHelper.java:96)
at com.intellij.ide.plugins.PluginManagerMain.c(PluginManagerMain.java:336)
at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:330)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Check your IDE proxy settings: https://www.jetbrains.com/help/idea/http-proxy.html.

Try restarting IntelliJ IDEA.

no, I never use any proxy

Please check https://youtrack.jetbrains.com/issue/WEB-28879.

the problem solve!!

I think my notebook crash several times cause the problem

thank a lot for your patient

Same issue.

I solved it by completely deleting the cd %USERPROFILE%\.PhpStorm2017.2\ directory and let PhpStorm re-created it... 
Unfortunately you loose all the settings... 

This issue is already fixed. If you have it in the previous versions, you can just delete availables.xml.etag file.