{"id":171065,"date":"2023-06-05T07:05:36","date_gmt":"2023-06-05T07:05:36","guid":{"rendered":"\/knowledge\/forums\/topic\/how-to-avoid-the-error-warning-message-unable-to-start-message-handlerwhen-running-ansys-cfx-in-parallel\/"},"modified":"2023-07-31T12:29:58","modified_gmt":"2023-07-31T12:29:58","slug":"how-to-avoid-the-error-warning-message-unable-to-start-message-handlerwhen-running-ansys-cfx-in-parallel","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-avoid-the-error-warning-message-unable-to-start-message-handlerwhen-running-ansys-cfx-in-parallel\/","title":{"rendered":"How to avoid the error\/warning message &#8220;Unable to start message handler&#8221;when running ANSYS CFX in parallel"},"content":{"rendered":"<p>The following error\/warning message can appear when running ANSYS CFX parallel:  +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+ |                  Job Information at Start of Run                   | +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+   Run mode:       parallel run (MPI)   Job started:    Wed Jun  7 12:33:05 2017   +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+ | ERROR #001100288 has occurred in subroutine CTRL_MESG_HANDLER.     | | Message:                                                           | |  The following message handling error occurred:                    | |  Unable to start message handler.                                  | |  Hostname:    newton01                                             | |  Port number:        0                                             | |                                                                    | |  Messages will now be handled using a less robust method,          | |  with a greater risk of parallel deadlocks.                        | |                                                                    | |  Note: Ensure that the hostname shown above can be resolved        | |  from all hosts used for the run.                                  | +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+   If this occurs, please check:  -Network settings in \/etc\/hosts -Password-less ssh login -Check the default path (if the default path points to a gateway that is not reachable, password-less ssh and parallel simulations are possible, but the message handler is still unable to start and a less robust messaging method is used.<\/p>\n","protected":false},"template":"","class_list":["post-171065","topic","type-topic","status-publish","hentry","topic-tag-4422","topic-tag-cfx","topic-tag-error-message","topic-tag-fluid-dynamics","topic-tag-general-cfx","topic-tag-parallel"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["2\/6\/2023 20:20"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["209.182.204.162"],"_btv_view_count":["610"],"siebel_km_number":["2050557"],"product_version":["18"],"km_published_date":["2017-06-26T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/171065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/171065\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=171065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}