Labels

Monday, March 24, 2008

Testing Network Ports from Windows

This article provides information on how to effectively test network connectivity between a local and remote endpoint on specific network ports and protocols.

Several methods are described, including portqry, port reporter and telnet.

Using PortQry.exe 2.0

The PortQry utility provides the flexibility to test any port number or range over TCP and UDP, as well as forcing a local source port and the destination. From a command prompt, run:

  1. portqry -n %server% -e %endpoint% -v

For example:
Portqry -n server1 -e 135 -v
Portqry -n server2 -e 53 -v -p BOTH
Portqry -n server3 -e 80 -v

Note that in the first example above, if RPC to server1 was not permitted, the result would be 'TCP port 135 (epmap service): FILTERED', whereas if it were allowed, a list of UUID's currently recorded by the endpoint mapper would be returned (also useful information in some cases).

Using telnet.exe

Remote endpoints on a particular TCP port that return a response (such as HTTP, FTP, SMTP etc) can be easily tested with telnet, from a command prompt run:

  1. Telnet %remoteServer% %Port%
  2. If the connection is established you may need to press enter or escape to receive a further response.

For example:
Telnet server3 80

Using Port Reporter

Locally on the machine:

  1. Obtain the port reporter tool from http://support.microsoft.com/kb/837243
  2. Install PortReporter by running: pr-setup -d '%systemroot%\temp'
  3. Start the PortReporter service: net start portreporter
  4. Perform the actions you want to log, log files are stored in %systemroot%\System32\LogFiles\PortReporter, PR-PORTS* contains the recorded port activity
  5. Stop the PortReporter service: net stop portreporter
  6. Uninstall PortReporter by running : pr-setup.exe -u

Notes:

  1. See the reference to article 837243 for more information on how to interpret the log files
  2. The PR-PORTS* log file is formatted by: date,time,protocol,local port,local IP address,remote port,remote IP address,PID,module,user context

References:

New features and functionality in PortQry version 2.0

http://support.microsoft.com/default.aspx?kbid=832919

How to Make Portqry.exe Only Report Listening Ports

http://support.microsoft.com/kb/310513/

How to Use Portqry.exe to Troubleshoot Microsoft Exchange Server Connectivity Issues

http://support.microsoft.com/kb/310298/

How to Use Portqry to Troubleshoot Active Directory Connectivity Issues

http://support.microsoft.com/kb/310456/

http://support.microsoft.com/kb/310099/

Availability and description of the Port Reporter tool

http://support.microsoft.com/?id=837243

http://www.microsoft.com/downloads/details.aspx?FamilyID=69BA779B-BAE9-4243-B9D6-63E62B4BCD2E&displaylang=en



Wayne's World of IT (WWoIT), Copyright 2008 Wayne Martin.

No comments:


All Posts

printQueue AD objects for 2003 ClusterVirtualCenter Physical to VirtualVirtual 2003 MSCS Cluster in ESX VI3
Finding duplicate DNS recordsCommand-line automation – Echo and macrosCommand-line automation – set
Command-line automation - errorlevels and ifCommand-line automation - find and findstrBuilding blocks of command-line automation - FOR
Useful PowerShell command-line operationsMSCS 2003 Cluster Virtual Server ComponentsServer-side process for simple file access
OpsMgr 2007 performance script - VMware datastores...Enumerating URLs in Internet ExplorerNTLM Trusts between 2003 and NT4
2003 Servers with Hibernation enabledReading Shortcuts with PowerShell and VBSModifying DLL Resources
Automatically mapping printersSimple string encryption with PowerShellUseful NTFS and security command-line operations
Useful Windows Printer command-line operationsUseful Windows MSCS Cluster command-line operation...Useful VMware ESX and VC command-line operations
Useful general command-line operationsUseful DNS, DHCP and WINS command-line operationsUseful Active Directory command-line operations
Useful command-linesCreating secedit templates with PowerShellFixing Permissions with NTFS intra-volume moves
Converting filetime with vbs and PowerShellDifference between bat and cmdReplica Domain for Authentication
Troubleshooting Windows PrintingRenaming a user account in ADOpsMgr 2007 Reports - Sorting, Filtering, Charting...
WMIC XSL CSV output formattingEnumerating File Server ResourcesWMIC Custom Alias and Format
AD site discoveryPassing Parameters between OpsMgr and SSRSAnalyzing Windows Kernel Dumps
Process list with command-line argumentsOpsMgr 2007 Customized Reporting - SQL QueriesPreventing accidental NTFS data moves
FSRM and NTFS Quotas in 2003 R2PowerShell Deleting NTFS Alternate Data StreamsNTFS links - reparse, symbolic, hard, junction
IE Warnings when files are executedPowerShell Low-level keyboard hookCross-forest authentication and GP processing
Deleting Invalid SMS 2003 Distribution PointsCross-forest authentication and site synchronizati...Determining AD attribute replication
AD Security vs Distribution GroupsTroubleshooting cross-forest trust secure channels...RIS cross-domain access
Large SMS Web Reports return Error 500Troubleshooting SMS 2003 MP and SLPRemotely determine physical memory
VMware SDK with PowershellSpinning Excel Pie ChartPoke-Info PowerShell script
Reading web content with PowerShellAutomated Cluster File Security and PurgingManaging printers at the command-line
File System Filters and minifiltersOpsMgr 2007 SSRS Reports using SQL 2005 XMLAccess Based Enumeration in 2003 and MSCS
Find VM snapshots in ESX/VCComparing MSCS/VMware/DFS File & PrintModifying Exchange mailbox permissions
Nested 'for /f' catch-allPowerShell FindFirstFileW bypassing MAX_PATHRunning PowerSell Scripts from ASP.Net
Binary <-> Hex String files with PowershellOpsMgr 2007 Current Performance InstancesImpersonating a user without passwords
Running a process in the secure winlogon desktopShadow an XP Terminal Services sessionFind where a user is logged on from
Active Directory _msdcs DNS zonesUnlocking XP/2003 without passwords2003 Cluster-enabled scheduled tasks
Purging aged files from the filesystemFinding customised ADM templates in ADDomain local security groups for cross-forest secu...
Account Management eventlog auditingVMware cluster/Virtual Center StatisticsRunning scheduled tasks as a non-administrator
Audit Windows 2003 print server usageActive Directory DiagnosticsViewing NTFS information with nfi and diskedit
Performance Tuning for 2003 File ServersChecking ESX/VC VMs for snapshotsShowing non-persistent devices in device manager
Implementing an MSCS 2003 server clusterFinding users on a subnetWMI filter for subnet filtered Group Policy
Testing DNS records for scavengingRefreshing Computer Account AD Group MembershipTesting Network Ports from Windows
Using Recovery Console with RISPAE Boot.ini Switch for DEP or 4GB+ memoryUsing 32-bit COM objects on x64 platforms
Active Directory Organizational Unit (OU) DesignTroubleshooting computer accounts in an Active Dir...260+ character MAX_PATH limitations in filenames
Create or modify a security template for NTFS perm...Find where a user is connecting from through WMISDDL syntax in secedit security templates

About Me

I’ve worked in IT for over 13 years, and I know just about enough to realise that I don’t know very much.