Proxy Server

The main function of a Proxy server is to establish a connection between Dr.Web Server and Dr.Web Agents in cases when it is impossible to set up direct access (e.g. if Dr.Web Server and Dr.Web Agents are located in separate networks which do not have packet routing between them).

To establish a connection between the Server and clients via the Proxy server, it is recommended to disable traffic encryption. For this, it is enough to set the no value for the Encryption parameter in the Dr.Web Server Configuration → General section.

1.Network listening and receipt of connections according to the specified protocol and port.

3.Data transmission between Dr.Web Server and Dr.Web Agents according to the Proxy server settings.

4.Caching of Agent and anti-virus package updates, which are translated by the Server. In case of using cache of the Proxy server to translate updates, following are provided:

Proxy servers can be composed to hierarchical structure.

The general diagram of the anti-virus network when a Proxy server is used is illustrated in the figure below.

	Dr.Web Server		LAN
	Proxy Server		Internet
	Protected computer		Router

1.If the address of the Server is not specified on the Agent, the Agent sends a multicast request according to the protocol of the network.

2.If the Proxy server is set up to translate connections (the discovery="yes" parameter), a message about the availability of an operating Proxy server is sent to the Agent.

3.The Agent sets the received Proxy server parameters for Dr.Web Server. Further intercommunication is performed transparently for the Agent.

4.The Proxy server listens specified ports for incoming connections via given protocols according to the configuration file.

5.For each incoming connection from the Agent (or Dr.Web Server) the Proxy server establishes a connection with Dr.Web Server (or Agent).

1.Proxy server loads to RAM the list of Dr.Web Servers from the drwcsd-proxy.xml configuration file (see the Appendices document, p. Appendix G4).

3.Proxy server forwards Dr.Web Agent to the first Server from Dr.Web Servers list loaded in the RAM.

4.Proxy server rotate the list in the RAM and moves Dr.Web Server from the first position to the end of list.

Proxy Server does not save changed order of Servers to its configuration file. After restart of Proxy server, the list of Dr.Web Servers is loaded to the RAM in original version, which is stored in the configuration file.

5.When the next Agent connects to the Proxy server, procedure is repeated from the step 2.

6.If Dr.Web Server disconnects from the anti-virus network (e.g., gets offline or denies of service), the Agent connects to the Proxy server repeatedly and procedure is repeated from the step 2.

Network scanner which is launched from an external network (in respect to the Agents) is unable to locate the installed Agents.

If the Replace NetBios names flag is set and anti-virus network contains the Proxy server, when for all stations connected to the Server via the Proxy server, in Dr.Web Security Control Center, the name of computer on which the Proxy server is installed, will be shown instead of stations names.

Proxy server supports traffic compression. Transferred data is processed regardless of whether traffic is compressed or not.

Proxy server does not support traffic encryption. It analyzes transferred data and if traffic between Dr.Web Server and Agent is encrypted, Proxy server switches to the transparent mode, i.e. transfers all traffic between Server and Agent without any data analyzing.

If encryption between Server and Agent is enabled, Proxy server do not caching updates.

Products are cached by revisions. Each revision stores in separate directory. Directories with all next revisions contain hard links on existing files from old revisions and originals for changed files. Thus, files for each version are stored on a hard drive in a single exemplar, all directories for next revisions contain only links on unchanged files.

According to the settings specified in the configuration file, the following actions are performed if the caching is enabled:

•Only latest revisions are stored. All other, earlier revisions are considered outdated and are deleted. By default 3 last revisions are stored.

•Unused memory mapped files are periodically unloaded. By default—each 10 minutes.

The Proxy server does not have a GUI. Its settings are adjusted via a configuration file. The format of the configuration file is described in the Appendices document, p. Appendix G4.

Only user with administrative rights on the computer can manage settings (edit configuration file) of Proxy server.

For proper operation of Proxy server under Linux system-based OS after computer reboot, you must edit system network configuration without Network manager.

To start and stop the Proxy server under Windows OS, open Control Panel → Administration → Services, then double-click drwcsd-proxy and select a necessary action in the opened window.

To start and stop the Proxy server under a UNIX-based OS, use the start and stop commands with scripts created during installation of the Proxy server (see the Installation Manual, p. Installing Proxy Server).

To start the Proxy-server under both Windows OS and UNIX system-based OS, you can run the drwcsd-proxy executable file with corresponding switches (see the Appendices document, p. H9. Proxy Server).