{"id":161965,"date":"2023-01-25T07:28:20","date_gmt":"2023-01-25T07:28:20","guid":{"rendered":"\/knowledge\/forums\/topic\/error-could-not-connect-to-any-license-server-the-server-is-down-or-is-not-responsive-no-buffer-space-available-maximum-connections-reached-due-to-ephemeral-port-exhaustion\/"},"modified":"2023-07-31T12:36:12","modified_gmt":"2023-07-31T12:36:12","slug":"error-could-not-connect-to-any-license-server-the-server-is-down-or-is-not-responsive-no-buffer-space-available-maximum-connections-reached-due-to-ephemeral-port-exhaustion","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/error-could-not-connect-to-any-license-server-the-server-is-down-or-is-not-responsive-no-buffer-space-available-maximum-connections-reached-due-to-ephemeral-port-exhaustion\/","title":{"rendered":"Error::  Could not connect to any license server. The server is down or is not responsive&#8221;   No buffer space available, maximum connections reached due to ephemeral port exhaustion"},"content":{"rendered":"<p>We recommend increasing to 65534 ports, and lowering the recycle timer as you have now done, in order to both allow for more ephemeral connections as well as a faster recycling of unused connections.    Start Registry Editor. Backup the registry Browse to, and then click the following key in the registry:   HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters On the Edit menu, click New, DWORD Value, and then add the following registry value to increase the number of ephemeral ports that can by dynamically allocated to clients:   Value name MaxUserPort Value data <Enter a DECIMAL value of 65534 here> On the Edit menu, click New, DWORD Value, and then add the following registry value to reduce the length of time that a connection stays in the TIME_WAIT state when the connection is being closed. While a connection is in the TIME_WAIT state, the socket pair cannot be reused:   Value name TcpTimedWaitDelay Value data <Enter a DECIMAL value of 30 here> Close the Registry Editor. Reboot the machine for the changes to take effect Confirm the changes after the restart using this command:   netsh int ipv4 show dynamicportrange tcp<\/p>\n","protected":false},"template":"","class_list":["post-161965","topic","type-topic","status-publish","hentry","topic-tag-2020-r1","topic-tag-connect","topic-tag-installation-licensing-systems","topic-tag-license-not-releasing","topic-tag-licensing","topic-tag-mechanical-sys","topic-tag-tcp"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"We recommend increasing to 65534 ports, and lowering the recycle timer as you have now done, in order to both allow for more ephemeral connections as well as a faster recycling of unused connections. Start Registry Editor. Backup the registry Browse to, and then click the following key in the registry: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters On the Edit\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/error-could-not-connect-to-any-license-server-the-server-is-down-or-is-not-responsive-no-buffer-space-available-maximum-connections-reached-due-to-ephemeral-port-exhaustion\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Error:: Could not connect to any license server. 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Backup the registry Browse to, and then click the following key in the registry: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters On the Edit\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/error-could-not-connect-to-any-license-server-the-server-is-down-or-is-not-responsive-no-buffer-space-available-maximum-connections-reached-due-to-ephemeral-port-exhaustion\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-01-25T07:28:20+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:36:12+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Error:: Could not connect to any license server. The server is down or is not responsive\u201d No buffer space available, maximum connections reached due to ephemeral port exhaustion | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"We recommend increasing to 65534 ports, and lowering the recycle timer as you have now done, in order to both allow for more ephemeral connections as well as a faster recycling of unused connections. Start Registry Editor. 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