LIMITATIONS AND WARNINGS
Kaspersky Internet Security has a number of limitations that are not critical to operation of the application.
Limitations on upgrades from a previous version of the application
During an upgrade of a previous version of Kaspersky Internet Security, the following application settings
are reset to their default values: update sources, the list of trusted URLs, and the settings of Kaspersky URL
When a new version of Kaspersky Internet Security is installed over Kaspersky Internet Security 2011 and
earlier, backup copies of files and quarantined objects are lost because their format is not supported and cannot
be converted to the new format. During an upgrade from Kaspersky Internet Security 2012, the backup copies
of files and quarantined objects can be converted to the new format. The backup storage in Kaspersky Internet
Security 2013 or later format is supported and does not require converting to the new format.
After an upgrade from a previous version of the application, Kaspersky Internet Security starts automatically
even if automatic startup of the application is disabled in the settings that have been saved. When the operating
system restarts afterwards, Kaspersky Internet Security does not start automatically if automatic startup of the
application is disabled in the settings that have been saved.
Limitations on the operation of certain components and automatic processing of files
Infected files are processed automatically according to rules created by Kaspersky Lab specialists. You cannot modify
these rules manually. Rules can be updated following an update of databases and application modules. Firewall,
Application Control, and Trusted Applications mode rules are also updated automatically.
Website certificate check and file scan limitations
When checking a website certificate or scanning website files, the application may contact Kaspersky Security Network
for information. If data from Kaspersky Security Network could not be retrieved, the application decides whether or not
the file is infected and the certificate untrusted based on local anti-virus databases.
Limitations of System Watcher functionality
Protection against cryptors (malware that encrypts user files) has the following limitations:
The Temp system folder is used to support this functionality. If the system drive with the Temp folder has
insufficient disk space to create temporary files, protection against cryptors is not provided. In this case, the
application does not display a notification that files are not backed up (protection is not provided).
Temporary files are deleted automatically when you close Kaspersky Internet Security or disable the System
In case of an emergency termination of Kaspersky Internet Security, temporary files are not deleted
automatically. To delete temporary files, clear the Temp folder manually. To do so, open the Run window
(Run command under Windows XP) and in the Open field type %TEMP%. Click OK.
Encrypted connections scan limitations
Due to technical limitations of the implementation of scanning algorithms, scanning of encrypted connections does not
support certain extensions of the TLS 1.0 protocol and later versions (particularly NPN and ALPN). Connections via
these protocols may be limited. Web browsers with SPDY protocol support use the HTTP over TLS protocol instead of
SPDY even if the server to which the connection is established supports SPDY. This does not affect the level of
connection security. If the server supports only the SPDY protocol and it is impossible to establish the connection via the
HTTPS protocol, the application does not monitor the connection established.