https://community.appian.com/discussions/f/administration/11202/unable-to-restart-17-3Ie updated our 17.2 install too 17.3 and yesterday started the services and was happy to report everything worked. However this morning I was unable to login to the server and was getting a username / password invalid error. I checked and all otheren-USTelligent Community 12https://community.appian.com/thread/51729?ContentTypeID=1Fri, 12 Jan 2018 22:13:24 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:a5b8573f-0d38-4246-b761-aa6b6315b2cejayakumarsI too am interested in the RCA of this issue.<div style="clear:both;"></div>https://community.appian.com/thread/51481?ContentTypeID=1Tue, 09 Jan 2018 10:07:13 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:818901d4-0e33-493a-8386-3b04c0ae1064charanrajkrishnap0001Hi pauls985:<br /> <br /> Did you get the root cause of the issue.?<br /> <br /> I am facing the same issue.<div style="clear:both;"></div>https://community.appian.com/thread/50955?ContentTypeID=1Mon, 18 Dec 2017 19:02:08 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:e1ae987c-3147-4b5f-86b4-d4c35a9ea7feaswinb608please try rebooting the OS and then starting engines<div style="clear:both;"></div>https://community.appian.com/thread/49210?ContentTypeID=1Mon, 09 Oct 2017 05:02:29 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:63be54b9-ac04-45cc-beb4-8d79a5cbdcb0Rama Thummala<p>pauls985 , Seems engines didn&#39;t shutdown properly last time.</p> <p>Stop all the engines.(make sure all engines properly shutdown)</p> <p>Run the checkpoint script again.</p> <p>Start the engines and check the status.</p> <p>If it didn&#39;t work, you need to <a href="https://docs.appian.com/suite/help/17.1/Appian_Engine_Repair.html">repair </a>your engines.</p> <p>If you couldn&#39;t repair , I would suggest to perform upgrade again.</p> <p>Hope it will help you..!!!</p><div style="clear:both;"></div>