PERMISSION DENIED (Photo by Hidde van Esch on Unsplash)

If you recently updated your RedHat or CentOS 7.6 system, you may suddenly start getting “Permission Denied” errors when attempting to mount SMB shares via CIFS. Typical error messages in syslog look like this:

kernel: Status code returned 0xc000006d STATUS_LOGON_FAILURE
kernel: CIFS VFS: Send error in SessSetup = -13
kernel: CIFS VFS: cifs_mount failed w/return code = -13

Configuration that triggered the problem

Synology NAS with latest operating system shares a volume via SMBCentOS 7 Linux server mounts SMB share using a local username and password (NOT domain credentials)cifs-utils version 6.2 installed in May of 2019 (this by itself worked fine)libsmbclient just updated to 4.9.1-6libmount just updated to 2.23.2-61CIFS mount options: vers=3.0,credentials=/root/credentials.txt,sec=ntlmsspi* File /root/credentials.txt contained a username and password that are LOCAL to the SMB server