What is AegisP?

The genuine AegisP.sys file is a software component of AEGIS Protocol IEEE by Cisco.
A driver file for Aegis 802.1x Protocol network devices, this process starts with Windows and runs in the background. A wireless protocol, this driver allows Cisco AEGIS Protocol cards to communicate with the operating system. The most recent version of this driver was released in 2005. Based in San Jose, California, Cisco Systems is the world leader in network hardware.

AegisP stands for Aegis Protocol Driver

AegisP.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if AegisP.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for AegisP drivers in need of updating

AegisP.sys file information

The process known as IEEE 802.1X Protocol Driver belongs to software AEGIS Protocol (IEEE (version 802.1x)) or AEGIS Client by Meetinghouse Data Communications ( or Cisco Systems (

Description: AegisP.sys is not essential for Windows and will often cause problems. AegisP.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 17,801 bytes (22% of all occurrences), 21,275 bytes and 11 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The AegisP.sys file is not a Windows system file. AegisP.sys appears to be a compressed file. Therefore the technical security rating is 27% dangerous, however you should also read the user reviews.

Recommended: Identify AegisP.sys related errors

Important: Some malware disguises itself as AegisP.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the AegisP.sys 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

seems to be used for wireless network or internet
  Bill Plunkett  
aegisP protocol
intalled like a virus and not wanted. very upset !
seems to be installed by linksys (cisco) wireless adapters
    (further information)
aegisp.sys is installed with mose cisco products, USB wireless recievers, Router software, even their USB 2.0 Modem driver, HOWEVER an exploited version going around in certain viruses. If your antivirus picked up aegisp.sys as malicious, it is best to quarantine it and re-install the original driver/software from the Cisco disk
Installed with Edimax wireless network usb stick
IEE 802.1x protocol driver and system file
  kai r schantz  
AegisP properties identified it as a MeetingHouse Communications file. The file was identified by my firewall as being contacted by Yahoo. I had Yahoo messenger running at the time. I moved it to another locaiton and blocked it from contact with Yahoo. My Yahoo messenger kept running and did not crash when I removed it. I do not know the purpose for yahoo contacting this file. A Whois reverse lookup identfied the remote system trying to make contact: IP
  Karl   (further information)
It is installed with many wirless and routing devices. Also you will find this is installed as a network adaptor protocol in which you will find in your adaptors properties. It manages port security
  Ned Kelly  
autostarts according to TDSS Killer utility by Kaspersky, it may in fact be a part of Linksys drivers but if you've uninstalled it you should quarantine it and remove it if no longer needed.

Rating chart

Summary: Average user rating of AegisP.sys: based on 19 votes with 10 user comments. 5 users think AegisP.sys is essential for Windows or an installed application. 5 users think it's probably harmless. 5 users think it's neither essential nor dangerous. One user suspects danger. 3 users think AegisP.sys is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving AegisP issues

A clean and tidy computer is the key requirement for avoiding problems with AegisP. 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 AegisP.sys 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

AegisP.sys [all]