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Telnet is used to connect to the ports that Exchange is expected to be using The banner that is returned in a telnet session validates that Exchange services are available It is simple to verify SMTP services by opening a telnet session to SMTP port 25 and sending a message manually:
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>telnet <servername> 25
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If an SMTP server is listening on port 25, such as the Microsoft Exchange ESMTP Service, a 220 reply returns a configured name for the listening server service:
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220 e2k7-mb-02virtuecorpcom Microsoft ESMTP Service Ready at <date and time>
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You can also validate other messaging-related ports in this manner, including POP3 and IMAP4 A telnet to port 110 would return the MSExchange POP3 service banner if it was configured to allow POP3 without SSL
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21:
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Tr o u b l e s h o o t i n g E x c h a n g e 2 0 0 7
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FIGURE 21-27 MAPI Editor on an Exchange 2007 mailbox server
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IPConfig is another command-line utility that can verify TCP/IP settings on a workstation or server Running ipconfig /all from the command prompt should return the IP configuration for all adapters Microsoft KB 314850 covers the various parameters that are defined for use with this tool
NSLookup
NSLookup validates hostname resolution on the network through general or specific queries against a certain Domain Name Services (DNS) server or for a certain query type, such as MX records Exchange and Outlook require a functioning DNS infrastructure to operate effectively
PART VI
RPCPing
Exchange and Outlook use Remote Procedure Calls (RPC) to communicate Microsoft provides the RPCPing utility in the Windows Server 2003 Resource Kit to verify connectivity between the Exchange server and the MAPI client Running RPCPing on the Exchange server
Part VI:
E-mail Continuity
verifies that it is able to accept Remote Procedure Calls The real intent is to run RPCPing from the workstation that may be experiencing problems RPCPing can also verify connectivity for Outlook Anywhere, formerly RPC/HTTPS
NetDiag
As the name suggests, NetDiag is a network diagnostic tool It can run a series of network tests to confirm the health of the network, reporting per-interface results and global results of diagnostic tests Along with DCDiag, it is a valuable tool to ensure your system is ready to install Exchange 2007 By the same measure, it can also be helpful to identify network issues in an existing system NetDiag is installed with the Windows 2003 Support Tools found on the Windows 2003 CD
DCDiag
The Domain Controller Diagnostics utility is a command-line tool from the Windows 2003 Server Support Tools that runs several tests analyzing the state of domain controllers In Exchange 2003, NetDiag and DCDiag were part of the prerequisite tests run using the Exchange deployment tools (exdeploy) These tests can be run together, or specific tests can be run against specific domain controllers For example, the systemlog test run against a single domain controller might show the following syntax:
>dcdiag /s:<DC_Hostname> /test:systemlog
Logic and Tools Summary
Okay, logic is not a software application, but it does apply to troubleshooting The helpdesk may have a set of questions in the form of a flowchart to ask users in a controlled assessment: If you are not getting new messages, do you see a Send/Receive error in Outlook If no, then Question A If yes, then Question B The administrator needs to combine the input from those experiencing problems with what the computers are showing in error dialogs and warnings to determine the scope of the issue (single user single server whole enterprise ) and what tool(s) to use to identify or confirm the problem and resolve it Clearly the SMTP logs are not going to help you with MAPI connectivity concerns In addition, there are a lot of different sources of information to assist with troubleshooting Sometimes the biggest challenge is actually determining which tool to use when faced with something to troubleshoot Table 21-2 is a simplified categorization of most of the tools we have considered so far
Category Clients Network DNS/AD Exchange Server List of Possible Tools to Use for Diagnosis Connectivity and protocol logging Ping, Telnet, RPCPing, IPConfig, NetDiag NSLookup, DCDiag, event logs Diagnostic logging (on Exchange processes), Troubleshooting Assistant (and its tools), EMS Test cmdlets
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