When you create a GCF share as described in Creating and editing a share, the password for the user account is stored in the GCF Shares table as described in GCF Shares table. If the password expires, you can directly change it in the table or you can change it with a command line tool installed with the GCF.
To change a password with the command line tool:
Run the following command line:
GCFChangeUp.exe [/M:<MachineName>] /V:<VaultName> /S:<ShareName> /U=<UserName> /P:<Password> [/NU:<NewUserName>] /NP:<NewPassword>
If the value of <Password> matches the existing password, it is changed to the value of <NewPassword>.
Note Empty passwords are accepted by this tool and by the GCF Share Details dialog box when you create a share.
The tool can be run in a batch file or other automated process and the exit code examined for the result of the action:
0 - Succeeded or nothing was changed
1 - Error occured; most likely a COM error from the EDM Server service
2 - Wrong user name or password passed in command line
3 - Wrong share name passed in command line
4 - Invalid command line