All searches fail

Searches can fail for the following reasons:

Occasional failures to connect to an Indexing service, perhaps dependent on the user or computer, can be caused by DCOM security problems. Use dcomcnfg to verify that the Indexing service access permissions allow access to Everyone.

Check the security on the Index Location folders, and all files and subfolders within them. They must have an ACL giving full access to the local Administrators group. Unless your policies dictate otherwise, these files and folders should not be accessible by anyone else.

Note:

The Vault Service account must be a member of the local Administrators group on every computer running Enterprise Vault software.