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After the service release SR3c ciscocm.4-1-3-sr3c.exe is installed on the Cisco CallManager Server, cannot make any changes to the Cisco CallManager settings. The "Either the current session has expired, or access has been denied." error message appears.
Computer Name Ensure that the computer name comprises a unique network name of 15 characters or less. It may contain alphanumeric characters and hyphens (-) and must begin with an alphabetical character. Make sure that the computer name and workgroup labels follow the rules for ARPANET host names.
Labels must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphens.
Ensure the computer name is unique to your network.
Ensure the computer name is not longer than 15 characters.
Do not include a space anywhere in the computer name, including leading or trailing spaces. Do not use the following characters and symbols, which are not valid entries in computer names: \ " / [ ] : | < > + = ; , ?.
As a workaround, you can also use the IP address instead of the hostname when accessing CallManager.