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CommuniGate Pro applies routing rules not only to addresses in incoming messages, but to all addresses it processes. If you have rerouted the postmaster account to some other account abc, then all attempts to log in as the postmaster will cause the Server to try to open the abc account. If you provide the correct password (i.e. the abc account password), you will be able to log in, but you will have the access rights granted to the abc account, not to the postmaster account.

You still can log into the postmaster account even if the postmaster name is redirected to a completely different address. Use the following name instead of the postmaster name:

When you connect to CommuniGate Pro via a browser, the Server checks the domain name you have specified in the browser URL. If that name matches the name of one of your Secondary Domains, the WebAdmin Interface of that Domain is opened, rather than the Server WebAdmin Interface.

To open the Server WebAdmin Interface, use the Main Domain Name in your browser URL. If that name does not have a DNS A-record or its record points to a different server, use the Server IP Address in the browser URL.

If all Server IP Addresses were assigned to secondary Domains, you can try to use ANY domain name that points to the CommuniGate Pro Server, and does not match any of the Secondary Domain names.

If all Server IP Addresses were assigned to secondary Domains and all DNS domain names pointing to your server are names of your secondary Domains or secondary Domain Aliases, then use the following URL:

Open the Network pages in the WebAdmin Settings realm, and open the Client IPs page. The Logins from Non-Client IP Addresses option is set to prohibit, so users can connect to the Server only from the addresses listed in the Client IP Addresses field (on the same page).

If the Client IP Addresses field was left empty, you still can connect to the Server if you launch your browser on the Server computer itself, and connect locally, using the http://127.0.0.1:8010 URL.

If you have not entered anything into the Client IP Addresses field, or if you cannot connect from the IP Addresses listed in that field, and you cannot connect to the server locally, using the http://127.0.0.1:8010 URL, then:

• stop the CommuniGate Pro Server;
• open the {base}/Settings/IPAddresses.settings file and change the ClientOnly option from YES to NO, and save the updated file.
• start the CommuniGate Pro Server again.

When the SMTP module receives messages, it tries to route the address specified in the Mail From command (the message 'Return-Path' address). If the domain name in that address is a name of the Server local Domain and the specified Account (or other Object) is not found in that Domain, the Router returns an error code and the SMTP module refuses to accept the message.

You should reconfigure your script/applet to use either an empty Return-Path (<>) for generated messages, or to use an E-mail address of some existing Account. If the script/applet cannot be reconfigured, you can create an Alias for any existing Account.

If, for example, your script/applet submits messages to your server with the <webform@mydomain.com> Return-Path address, and you do not have the webform Account in the mydomain.com Domain, you may want to create the webform alias for the postmaster Account. If delivery of a submitted message fails, the error report will be sent to the postmaster Account.

When the CommuniGate Pro SMTP module connects to a mail host/relay and tries to establish a secure (SSL/TLS) connection, it receives the host Certificate and check the name in that certificate. That name should match either the name of the domain the mail should go to, or the MX relay name for that domain.

When a remote server hosts several domains on the same IP address, it always sends out only one certificate, because the server cannot learn to which domain the incoming messages will go to and thus it cannot present the Certificate for that particular domain. As a result, your (sending) server may refuse to proceed.

If the server mainhost.com also hosts client1.com and client2.com domains, and the MX records for all 3 domains point to the same name and to the same IP address on that server, the server will always present only one Certificate - usually, the mainhost.com Certificate.

It is very important to understand that the domain name something.com and mail.something.com are completely different domain names. If your CommuniGate Pro Server has the main domain mycompany.dom, and you are trying to connect to it by typing http://mail.mycompany.com:8100 in your Web browser, you will get the page saying that the CommuniGate Pro Server does not provide access to the mail.mycompany.com domain.

In most cases, you want the domain names mail.mycompany.com, webmail.mycompany.com, etc. to be just other names (aliases) of the mycompany.com CommuniGate Pro Domain. To specify this, open the mycompany.com Domain Settings page and find the Aliases table. In an empty field, enter the mail.mycompany.com name and click the Update button. Now the CommuniGate Pro Server will know that mail.mycompany.com domain name is just a different name for the mycompany.com Domain it serves. Connection requests specifying the mail.mycompany.com domain name will connect to the mycompany.com CommuniGate Pro Domain, and messages sent to a username@mail.mycompany.com address will be delivered to the account username in the mycompany.com domain.

Note: The WebAdmin interface opens the Server Adminstrator Interface if the name specified in the browser URL is not a CommuniGate Pro Domain name. This is why connections to the WebAdmin port (8010) can work, while the connections to the WebUser port (8100) return the "pink page".

When a user connects to your server via a "multi-homed HTTP proxy" (used by large ISPs such as AOL), TCP connections come to the CommuniGate Pro Server from several different IP addresses of those proxy servers. If the Require Fixed Network Address option is enabled in the Account WebUser Preferences, user browser connections can be rejected. Disable the Require Fixed Network Address option for those users that connect via "multi-homed proxy" servers. If most of your users connect via those proxy servers, you may want to disable this setting in the Domain Account Defaults or in the All-Server Account Defaults.

Your CommuniGate Pro server computer has one or serveral IP (network) addresses assigned to it. Those addresses can be assigned to CommuniGate Pro Domains, and the Domains WebAdmin page shows all Domains with the IP addresses assigned to them.

Usually, the Main Domain has the Assigned IP Addresses setting set to All Available, so all IP Addresses not assigned to secondary Domains are automatically assigned to the Main Domain. If none of your Domains has the Assigned IP Addresses setting set to All Available, then some of your Server IP addresses may be not assigned to any Domain.

When a user connects to the server using a POP or IMAP client and provides just the account name (without the domain name), or when a secure (SSL/TLS) connection has to be established, the CommuniGate Pro Server takes the local IP address the user has connected to and tries to find the Domain that address is assigned to. If that IP address is not assigned to any CommuniGate Pro Domain, then the "unassigned local network address" error is generated.

Open the WebAdmin Settings->General page to see all the Local IP Addresses of your Server. You may have to click the Refresh button to see all addresses. The unassigned addresses are dispalyed in red.

Most of LDAP clients (including the Microsoft Outlook products) contain a setting specifying the Directory subtree that should be used for search operations. In Outlook Express, this setting can found in Tools->Accounts->Directory Service, on the Advanced stub. It is called Search Base and it should contain the DN for the user domain (by default, that DN is cn=domainname).

If this setting field is left empty, Outlook products silently replace it with the c=country_code string, and search operations fail (unless your Directory has the c=country_code subtree).

If you do want to search the entire Directory with an Outlook product, enter the word top into the Search Base setting field.

This problem is caused by an incorrect Time Zone setting on the server and/or on the client machines. To check the Time Zone setting value on the server machine, open the General page in the Settings realm of the CommuniGate Pro WebAdmin Interface. The Server Time field should contain the correct Date and Time values and the correct Time Zone value: -0800 means '8 hours behind the GMT', +0800 means '8 hours ahead of GMT'.

If the Time Zone value is incorrect, fix the OS settings that specifies that value, and re-open the General page to verify the Time Zone value.

The WebAdmin interface adds the LoginPage@ string to the domain name you specify in your browser URL field and tries to route the resulting address as any other E-mail address. If routing fails, the WebAdmin Interface defaults to the main domain and to the Server WebAdmin Interface, but the failure record appears in the Router Log:

When your SMTP module uses RBLs to check the IP address of the server that tries to send any mail to your server, it converts that server aa.bb.cc.dd IP Address into the dd.cc.bb.aa.rbl-server-name domain name, and tries to resolve this name using the DNS system. If the sending server is not a known offender, and its address is not included into the RBL database, this composed domain name will NOT exist in the DNS system, and the DNR module will report this with a Problem-level Log record.

If you use RBL servers, you may want to restrict the DNR module Log Level to Major & Failures events only.

This is a DNR (Domain Name Resolver) socket. The port number is selected by the OS, and it can change if you restart the CommuniGate Pro Server. This socket is used to send requests (UDP packets) to DNS servers and to receive responses from those servers.

Other applications (servers, browsers, etc.) use the same type of sockets to resolve domain names, but they usually open and close those UDP sockets quickly, so you may not notice them in your netstat output. CommuniGate Pro opens the DNR UDP socket when it starts, and uses that socket for all DNR requests, closing the socket only when the Server shuts down.