Firewall Configuration for Multi Server Mode

It is highly recommended to protect any MailStore Service Provider Edition service with appropriate firewall rules. This document should help with setting up the required rules. The firewall rules for running the SPE in Single Server Mode can be found in this document.

Important Notices:

• The communication channels described below MUST NOT be intercepted by any kind of email or web proxies that are provided as part of antivirus software or unified threat management gateways.
• If there are multiple Client Access Servers (CAS) and a load balancer is installed in front of these CAS, the load balancer must be configured in such a way that a user's sessions terminate on the same CAS (sticky sessions).
• The Windows Advanced Firewall is activated on any Windows Server installation by default. In order to connect to services (e.g. MailStore Management Console) of the MailStore Service Provider Edition, it is required that the appropriate firewall rules are added (see below).

The below table lists all TCP ports that need to be opened in the firewall when using MailStore Service Provider Edition in multi server mode. These are the default ports which may have been altered. The following abbreviations are used in the source and target columns:

• ANY = Any computer from private or public networks
• ADM = Computer or network used for administration
• CAS = Server hosting Client Access Server role
• IH = Server hosting Instance Host role
• MGMT = Server hosting Management Server role
• CA = Certificate Authority

Port	Source	Target	Description
80	ANY	CA	Access to certificate authorities to check certificate revocation status via HTTP.
110	IH	ANY	Access to email servers for archiving via POP3 (Unencrypted/STARTTLS).
143	IH	ANY	Access to email servers for archiving via IMAP (Unencrypted/STARTTLS).
143	ANY	CAS	IMAP access to archives secured by TLS (STARTTLS) encryption.
389	IH	ANY	Access to LDAP servers (including Microsoft Active Directory) using an unencrypted or STARTTLS-encrypted session.
443	IH	ANY	Access to Microsoft Exchange Server for archiving via Exchange Web Services (EWS) secured by SSL encryption.
443	IH	ANY	Access to IceWarp Mail Servers for synchronizing and authenticating users via API secured by TLS encryption.
443	ANY	CAS	HTTPS access to instances used by E-mail Archive Client, Outlook Add-in, and MailStore Web Access.
443	MGMT	my.mailstore.com	Usage reporting and license update. If a system wide proxy has been configured, it will be used. Important: DNS hostname MUST be used in firewall rules due to periodically changing IP addresses of my.mailstore.com.
587	MGMT	ANY	Access to an email server to let the Management Server send product update emails.
587	IH	ANY	Access to an email server to let instances send status reports.
636	IH	ANY	Access to LDAP servers (including Microsoft Active Directory) using a TLS encrypted connection.
993	ANY	CAS	IMAP access to archives secured by TLS encryption.
993	IH	ANY	Access to email servers for archiving via IMAP (TLS).
995	IH	ANY	Access to email servers for archiving via POP3 (TLS).
4040	IH	ANY	Access to Kerio Connect Servers for synchronizing users via API secured by TLS encryption.
8470	ADM	MGMT	Web-based access to the MailStore Management Console.
8471	CAS, IH	MGMT	Internal communication with Management Server
8472	MGMT, CAS	IH	Internal communication with Instance Hosts
8473	MGMT	CAS	Internal communication with Client Access Servers
8474	ADM	MGMT	Access to the MailStore Management API.
8474	IH, CAS	MGMT	Optional: Required for initial pairing with Management Server in Multi Server Mode. If not available, manual registration of Instance Hosts and Client Access Servers in Management Server is required.