Administrator's Guide - Kerio Software Archive

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Chapter 6 ServicesMax. number of concurrent connectionsThis option limits the number of concurrent connections to the selected service. Toomany concurrent connections may cause the server overload which can subsequentlylead to its failure. This is also the main idea of the so-called DoS (Denial of Service) attackwhere the attacker tries to overload the server by too many concurrent connections. Settingthe limit for the number of connections therefore helps to prevent the DoS (Denialof Service) attacks against your server.Warning: When you plan to limit the number of connections, consider the number ofserver users.6.2 Important NotesNon-secure and secure versions of the same service act as two separate services. This meansthat there are two different ways of accessing the same server and the user (client) can choosewhich one to use. For security and privacy protection reasons we strongly recommend usinga secure version of any communication means. However, this must be supported by clientsoftware.IMAP and HTTP access the same IMAP account in the same way. These two services can bothbe used (one at a time) without any limitations or risk. POP3 and IMAP/HTTP access thesame physical account but POP3 can only retrieve messages stored in the INBOX folder, as itcannot “see” other folders. All incoming messages are stored in the INBOX folder. POP3 alsodownloads all messages from the server to the client machine. This can lead to the followingcomplications:1. If a user logs into the account using POP3 first, all messages from the INBOX folder willbe downloaded to his/her machine. After logging in using IMAP, these messages will nolonger be at the server.2. If a user logs into the account using IMAP first (or uses HTTP) and moves messages toa folder other than INBOX, these messages will not be downloaded later using POP3.3. If a user has set rules such that all messages are moved to different folders, no messageswill be accessible via POP3.6.3 TroubleshootingWhen solving problems regarding services, logs of the traffic between the server and clientsmight be helpful. To log relevant information, enable a corresponding option under Logs →Debug in the Kerio Administration Console:1. In the Kerio Administration Console, go to the Logs section and select the Debug log.2. Right-click on the log pane to open a context menu, and select Messages.3. In the Logged Information dialog just opened, enable logging for the particular service (seefigure 6.5).60
6.3 TroubleshootingFigure 6.5The Debug log settings4. Confirm changes by OK.The following types of services are associated with the Debug log options:SMTPIf any problems arise in the communication between the SMTP server and a client, it ispossible to use the SMTP Server and SMTP Client options.POP3When problems with POP3 server arise, enabling the POP3 Server option might be helpful.IMAPWhen problems with IMAP server arise, enabling of the IMAP Server logging might behelpful.NNTPWhen problems with NNTP server arise, a log that can be enabled by the NNTP Serveroption might help.LDAPWhen problems with LDAP server arise, a log that can be enabled by the LDAP Serveroption might help.HTTP• HTTP Server — this option enables logging of HTTP traffic on the server’s side.• WebDAV Server Request — this option enables logging of queries sent from the Web-DAV server. It can be used in MS Entourage or Apple Mail where problems with Exchangeaccounts arise.• SyncML Synchronization — this option enables log that stores information on synchronizationof calendars and contacts over the SyncML Plug-in. The log may be helpfulwhen solving problems with synchronization over the Kerio Synchronization Plug-in.61
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Administrator’s GuideKerio Techno
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36 Support for ActiveSync . . . . .
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13.2 Creating a user accountNote: T
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13.2 Creating a user accountFigure
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13.3 Editing User AccountNote: When
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13.5 Removing user accountsKerio Ma
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13.9 Administration of mobile devic
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13.9 Administration of mobile devic
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13.10 Import Users• MailAddress
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13.10 Import UsersFor detailed info
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13.10 Import UsersFigure 13.24Impor
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13.12 User Account TemplatesNote: C
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Chapter 14User groupsUser accounts
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14.1 Creating a User GroupGroup add
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14.1 Creating a User GroupPublish t
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15.1 Mail Delivery over the Interne
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15.1 Mail Delivery over the Interne
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15.2 SMTP serverinterface originall
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15.2 SMTP serverAuthentication by I
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15.2 SMTP serverLimit maximum incom
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15.3 AliasesMaximum number of deliv
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15.3 AliasesCharacter typea-zA-ZDes
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15.4 remote POP3 mailboxesFigure 15
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15.4 remote POP3 mailboxesthe messa
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15.4 remote POP3 mailboxesFigure 15
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15.6 Advanced OptionsDescriptionA c
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15.6 Advanced Optionsnot have to wo
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15.6 Advanced OptionsPLAIN authenti
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15.6 Advanced OptionsWatchdog Hard
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15.6 Advanced OptionsFigure 15.22HT
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15.6 Advanced Optionsstartup of the
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15.6 Advanced OptionsKerio WebMail
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16.1 Spam Rating tab16.1 Spam Ratin
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16.2 Blacklists tabtration Console
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16.2 Blacklists tabInternet databas
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16.3 Custom RulesSORBSSpam and Open
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16.3 Custom RulesUse the Add button
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16.3 Custom RulesTypeType of condit
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16.4 SpamAssassinFigure 16.7SpamAss
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16.5 Email policy records checksend
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16.6 Spam repellentFigure 16.9SPFOn
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16.7 Recommended configuration of a
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16.7 Recommended configuration of a
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16.8 Monitoring of spam filter’s
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16.8 Monitoring of spam filter’s
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17.1 Integrated McAfee Anti-VirusBe
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17.4 Server responses to detection
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17.5 Filtering Email Attachments17.
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17.6 Antivirus control statisticsFi
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18.1 ArchivingPath to the archive d
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18.2 Backup of user foldersFigure 1
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18.2 Backup of user foldersFigure 1
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18.2 Backup of user folders• Save
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18.2 Backup of user folders2. The s
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Chapter 19LDAP serverThe built-in L
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19.2 Configuring Email ClientsFigur
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19.2 Configuring Email ClientsMaxim
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20.2 Creating a Mailing List• con
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20.2 Creating a Mailing ListFigure
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20.3 Posting rulesFigure 20.4Creati
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20.4 Moderators and MembersAdd this
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20.4 Moderators and MembersAdding a
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20.5 Mailing list archiving2. This
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20.7 How to use Mailing ListsExampl
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Chapter 21Status InformationKerio M
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21.2 Message queue processingFrom,
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21.3 Active ConnectionsActive Conne
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21.4 Opened FoldersComponentsThree
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21.5 Traffic ChartsTime rangeIn the
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21.6 StatisticsRefreshThis button r
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22.1 Log settingsFigure 22.2Save lo
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22.1 Log settingsLog debugSelect th
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22.3 MailAuth_type=’0’, Passwor
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22.4 SecurityMailing list messagesT
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22.4 SecurityAntibombingServer over
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22.8 Debug• From: jsmith@company.
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22.8 Debug• IMAP Server — commu
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22.9 Performance Monitor (under Win
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23.1 Viewing public folders in indi
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24.1 Kerio MailServer on WindowsFig
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24.1 Kerio MailServer on WindowsFig
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24.2 Kerio MailServer on LinuxExamp
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24.2 Kerio MailServer on Linuxdebug
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24.3 Kerio MailServer on Mac OSTo e
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24.3 Kerio MailServer on Mac OSFigu
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24.4 Starting Open Directory and Ke
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24.4 Starting Open Directory and Ke
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Figure 25.1Setting Windows NT domai
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25.1 Setting NTLM in MS Outlook ext
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Chapter 26Kerio MailServer Environm
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26.3 FirewallFrom technical reasons
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Chapter 27Deployment ExamplesThis c
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27.2 Dial-up Line + Domain Mailboxi
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27.4 A company with multiple sites5
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27.4 A company with multiple sitesF
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27.5 Setting up the backup mail ser
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Chapter 28Troubleshooting in Kerio
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28.2 Configuration Backup and Trans
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29.1 Installation of Active Directo
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29.3 User Account DefinitionFigure
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Chapter 30Kerio Open Directory Exte
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Chapter 31KMS Web AdministrationKMS
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31.2 Setting access rights to the w
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31.5 Page headerFigure 31.4Web Admi
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31.6 Welcome pageLocalizations of K
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31.7 User accountsFigure 31.8Templa
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31.7 User accountsFigure 31.10User
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31.7 User accountsFigure 31.12User
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31.8 User groupsMove user’s messa
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31.9 AliasesPublish this group info
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31.9 AliasesFigure 31.20Alias creat
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32.1 Kerio Outlook Connector (Offli
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32.2 Kerio Outlook ConnectorTIP: If
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33.1 InstallationNote: Kerio Synchr
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34.2 Windows Calendar34.2 Windows C
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Chapter 35CalDAV supportSince 6.5.0
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Chapter 36Support for ActiveSyncSup
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36.2 Supported versions of ActiveSy
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36.3 RoadSyncabcdeDevice typeEmail
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36.4 SSL encryptionWarning: It is n
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36.5 Remote deletion of the device
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36.6 Removing a device from the adm
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36.8 Troubleshooting36.8 Troublesho
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Chapter 37Support for BlackBerry vi
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If any problem occurs regarding com
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Chapter 40Kerio Sync Connector for
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Figure 40.2Log settings in Kerio Sy
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Apple Mail options and settings are
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42.1 Email42.1 EmailOn Apple iPhone
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43.1 Contacts43.1 ContactsUSAKerio
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Nokia ® and Mail for Exchange ® a
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arising from, out of or in connecti
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Glossary of termsApplication protoc
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MX RecordsOne of the record types t
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IndexAaccess rightsgroups 131accoun
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mailing lists 220MAPI 396master aut
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