A scan of a network share in Symantec Data Loss Prevention (DLP) fails with the error "No such mount exists -- <drive letter>:."
The listed drive is not available, or is mounted for a particular purpose for example for CD/DVD on Network Discover server. This can be verified on Windows Disk Management.
Component: DLP Network Discover on Windows
On the Network Discover server update the Crawler.properties file located at C:\Program Files\Symantec\DataLossPrevention\DetectionServer\<version>\Protect\config by removing the conflicting drive letter from the list of valid drive letters in the following setting:
# All valid drive letters to be used for mounting on windows
filesystemcrawler.mount.drive.validletters.windows = l:,m:,n:,o:,p:,q:,r:,s:,t:,u:,v:,w:,x:,y:,z:
Restart SymantecDLPDetectionServerService service.
In one instance, the steps above did not resolve the issue.
After removing the drive letter, the error repeated with another drive letter.
This was resolved by restarting the file share host server.