IBM Support

"Communication link failure ... The semaphore timeout period has expired" when logging onto Controller

Troubleshooting


Problem

User launches Controller client. User enters username/password. An error message appears. Problem is intermittent.

Symptom


Server was unable to process request. ---> System.Exception: Communication link failure
TCP Provider: The semaphore timeout period has expired

[{"Product":{"code":"SS9S6B","label":"IBM Cognos Controller"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"Controller","Platform":[{"code":"PF033","label":"Windows"}],"Version":"10.2.1","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}},{"Product":{"code":"SSMRTZ","label":"IBM Cognos Controller on Cloud"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}}]

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Document Information

More support for:
IBM Cognos Controller

Software version:
10.2.1

Operating system(s):
Windows

Document number:
293371

Modified date:
08 May 2025

UID

swg21999741

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