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Whenever you want to use Linked-Clone desktop pools on your environment, you need totally to View Composer service working correctly. but maybe after sometimes you will be faced with such as this warning: "Unable to connect to View Composer".
Regardless of well-known networking connectivity errors (port blocking, routing problem & etc) this error indicates that there is one of following conditions happened:
1. If you defined ODBC DSN with SQL server credentials, please check the "Enforce password policy" and "Enforce password expiration" check boxes on your login account settings. There is a simple way to check it: Re-run your DSN configuration wizard, provide the old setting and press "Test Data Sources..." button, then you can understand what was happened and if your credential is expired, you will know it.
2. If you provide Active Directory Credential instead of local SQL account, please check Group Policy is assigned to your AD account's OU. Maybe there is some restriction setting in "Password Policy" section.
3. For some reasons, maybe there is a problem on Composer server certificate validation, Especially whenever you have re-installed your composer component and want to choose your old certificate (Self-Signed or Valid-Generated). Then you must check your selected certificate for composer server:
Finally after all troubleshooting you can check your service correct operation by running netstat command and confirming connection on port 18433 is established.