What is portmap.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the portmap.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Portmap.exe file information

Windows Task Manager with portmap
Portmap.exe process in Windows Task Manager

The process known as Creo 2.0 from PTC or ONC/RPC Portmap service for NT belongs to software PTC Portmapper or ONC/RPC Portmap Service/NT by PTC.

Description: Portmap.exe is not essential for the Windows OS and causes relatively few problems. Portmap.exe is located in a subfolder of "C:\Program Files" (common is C:\Program Files\PTC\PTC Portmapper\i486_nt\obj\). Known file sizes on Windows 10/8/7/XP are 676,864 bytes (27% of all occurrences), 677,376 bytes and 8 more variants. 
The program has no visible window. The portmap.exe file is not a Windows core file. There is no file information. File is hidden. Portmap.exe is able to monitor applications. Therefore the technical security rating is 83% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software publisher PTC provides direct support ( or and update information ( You could completely remove PTC Portmapper or DPO (Control Panel ⇒ Uninstall a Program).

Recommended: Identify portmap.exe related errors

If portmap.exe is located in a subfolder of C:\Windows, the security rating is 79% dangerous. The file size is 45,056 bytes (90% of all occurrences) or 40,960 bytes. The process has no file description. The file is an unknown file in the Windows folder. The program is not visible. It is not a Windows system file. The program uses ports to connect to or from a LAN or the Internet.

If portmap.exe is located in the C:\Windows\System32 folder, the security rating is 90% dangerous. The file size is 45,056 bytes. There is no information about the author of the file. The program is not visible. It is an unknown file in the Windows folder. The file is not a Windows core file. The program uses ports to connect to or from a LAN or the Internet.

Important: Some malware camouflages itself as portmap.exe. Therefore, you should check the portmap.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

If you have QLogic FC-HBAs the file is found in Program Files\QLogic Corporation\SANsurfer and is essential for use with your Fibre Channel Host Bus Adapters.
  Andreas Dully   (further information)
is installed or executed by Winshape, simulation software by Heidenhein
  kokos   (further information)
Portmap.exe wird unter anderem von Kuka - Software benötigt ( 40960 Byte Größe ), Officelite Demo ohne portmap.exe läuft nicht richtig
  Michael   (further information)
Ist ein Service von PTC Pro/Engineer
Haben probleme da diese datei beschädigt oder gar fehlt :x
Rohde & Schwarz process, needed for remote controle of R&S Measurement Equipment (Professionnal Applications)

Summary: Average user rating of portmap.exe: based on 4 votes with 6 user comments. 3 users think portmap.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 2 users don't grade portmap.exe ("not sure about it").

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Best practices for resolving portmap issues

A clean and tidy computer is the key requirement for avoiding problems with portmap. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the portmap.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

portmap.exe [all]