Administrator's Guide - Kerio Software Archive

15.6 Advanced OptionsKerio WebMail interface as the main connection to their mailboxes, set the time to a valuebetween 8 and 10 hours. Too short interval might cause inappropriate closure of a session(while a user is editing a message, for example). This is not desirable.Note: If the user has started composing a message and has not finished it yet and thesession expires, user authentication will be required for reconnection. After successfulre-authentication, the message can be finished and sent.The Force WebMail logout if user’s IP address changes option uses another method to protectthe session. It might happen that a session of one user is hijacked by an attacker(especially if SSL-secured HTTP is not used) to access the server. Connection of an attackerto the session changes the client’s IP address. If the Force WebMail logout if user’sIP address changes option is enabled, Kerio MailServer detects change of the IP addressand terminates the session.Warning:• The “anti-hijack” protection must be disabled if Kerio MailServer users share theiraccounts. The option disallows connection to a single account from multiple hosts (IPaddresses) at a time.• The “anti-hijack” protection also cannot be applied if your ISP changes IP addressesduring the connection (e.g. in case of GPRS or WiFi connections).Select a logo for WebMailAt the top of each page of Kerio WebMail, Kerio Technologies logo is displayed. However,you can use any other logo or image instead (for more information on logo configuration,refer to chapter 11.2). The image parameters are as follows:• Format: GIF• Size: 200x40 pixelsClick Select to browse to the logo file.169