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8.3.1 Operation of the Mirror server

The computer hosting the Mirror server should always be running, and connected to the Internet or to an upper Mirror

server for replication. Mirror server update packages can be downloaded in two ways:

Using the HTTP protocol (recommended)

Using a shared network drive (SMB)

ESET‘s update servers use the HTTP protocol with authentication. A central Mirror server should access the update servers

with a username (usually in the following form: EAV-XXXXXXX) and password.

The Mirror server which is a part of ESET Smart Security/ESET NOD32 Antivirus has an integrated HTTP server (variant 1).

NOTE: If you decide to use the integrated HTTP server (with no authentication), please ensure that it will not be accessible

from outside your network (i.e., to clients not included in your license). The server must not be accessible from the

Internet.

By default, the integrated HTTP server listens at TCP port 2221. Please make sure that this port is not being used by any

other application.

NOTE: If the HTTP server method is in use, we recommend a maximum of 400 clients updating from one mirror. In large

networks with more clients, we recommend balancing mirror updates among more ERA (or ESS/EAV) mirror servers. If

the mirror needs to be centralized on a single server, we recommend using another type of HTTP server, such as Apache.

ERA also supports additional authentication methods (e.g., on Apache Web Server the .htaccess method is used).

The second method (shared network folder) requires sharing (“read” rights) of the folder containing update packages. In

this scenario, the username and password of a user with ”read” rights for the update folder must be entered into the client

workstation.

NOTE: ESET client solutions use the SYSTEM user account and thus have different network access rights than a currently

logged-in user. Authentication is required even if the network drive is accessible for ”Everyone” and the current user can

access them, too. Also, please use UNC paths to define the network path to the local server. Using the DISK:\ format is not

recommended.

If you decide to use the shared network folder method (variant 2), we recommend that you create a unique username (e.

g., NODUSER). This account would be used on all client machines for the sole purpose of downloading updates. The

NODUSER account should have ”read” rights to the shared network folder which contains the update packages.

For authentication to a network drive, please enter the authentication data in the full form: WORKGROUP\User or

DOMAIN\User.

In addition to authentication, you must also define the source of updates for ESET client solutions. The update source is

either a URL address to a local server (http://Mirror_server_name:port) or UNC path to a network drive: (\

\Mirror_server_name\share_name).

8.3.2 Types of updates

In addition to virus signature database updates (which can include ESET software kernel updates), program component

upgrades are also available. Program component upgrades add new features to ESET security products and require a

reboot.

The Mirror server allows an administrator to disable automatic downloading of program upgrades from ESET‘s update

servers (or from an upper Mirror server) and disable its distribution to clients. Distribution can later be triggered manually

by the administrator, if he is sure there will be no conflict between the new version and existing applications.

This feature is especially useful if the administrator wishes to download and use virus signature database updates when

there is also a new program version available. If an older program version is used in conjunction with the most recent virus

database version, the program will continue to provide the best protection available. Still, we recommend that you

download and install the newest program version to gain access to new program features.

By default, program components are not automatically downloaded and must be manually configured in ERAS. For more

information see chapter How to enable and configure Mirror .

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