CQ 5.5 Update 1 is now available on PackageShare. If you have installed CQ 5.5 Update 1 you may encounter the following error in the error.log after restarting the CQ instance:
*ERROR* [0:0:0:0:0:0:0:1%0  GET / HTTP/1.1] org.apache.sling.engine.impl.SlingHttpContext handleSecurity: AuthenticationSupport service missing. Cannot authenticate request.
After installing the Update 1 package, an info dialog appears which advises to “restart the instance”. If you restart the instance immediately after the dialog appears, you will run into this problem. Even after the dialog appears, the package keeps on installing behind the scenes. This process is interrupted if the instance is restarted at this point.
You should wait until the installation has completed before restarting CQ5, checking the activity in error.log. Once the error.log becomes quiet (after approx. 5 mins) it is safe to restart the instance.
After installing Update 1 check that all OSGi bundles have the status “ACTIVE” in the OSGi console. Start any bundles that do not have the “ACTIVE” status and this should resolve the issue.
If the issue persists, you may have to reinstall CQ5 from a fresh copy, install the update 1 package, restart (wait until error.log shows no more activity) and finally reinstall your installed packages manually.