Naming Conventions
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Do not use Microsoft Windows reserved names for names of the backup server, managed servers, backup repositories, jobs, tenants and other objects created in Veeam Backup & Replication: CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8 and LPT9. If you use a reserved name, Veeam Backup & Replication may not work as expected. For more information, see https://msdn.microsoft.com/en-us/library/aa365247.aspx?f=255&MSPPError=-2147217396#naming_conventions.