# SMB Service

The SMB (Server Message Block) is a protocol for sharing such resources as files and printers among computers. SMB operates on top of the NetBIOS protocol. The security device compares actual SMB traffic with maximum settings of what you consider to be normal SMB traffic. The security device considers any traffic exceeding such settings as anomalous.

To modify one or more of the following settings for SMB, enter a new value in the Current column for the parameter you want to adjust, and then click Apply:

Maximum Registry Key Length: Specifies the maximum number of bytes in an SMB registry key. Minimum: 32; maximum: 64,535; default: 8192.

Maximum Number of Login Failures per Minute: Specifies the maximum number of failed login attempts per minute to an SMB server from a single host. Minimum: 2; maximum: 100; default: 8.