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When I browse to a website it shows me an error message like

Blocked because of IPS attack    
An attack was detected, originating from your system. 
Please contact the system administrator.

The error appears in all browsers.

I have reset the internet explorer settings and I restarted the PC. But I still getting same message.

The error comes in PC which are in same network using same internet connection.But it is not a problem with website because in some other pc in different network website opens properly. How can I solve it?

IT researcher
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    Could you please post some more information, such as the exact error message, or the website you are trying to visit, whether this is a home network or a corporate network, etc... – G Koe Mar 19 '13 at 12:36
  • This message could be adressed not for you. It can be, for example, an explanation from hosting provider for the site admin. Check your PC but don't worry that much. I recall one paranoid site, that banned everybody not using Internet Explorer... – Barafu Albino Mar 19 '13 at 13:08
  • Basdic troubleshooting 101: If it works from all computers on your home network bar one, then you have a problem with that computer. If you get the same message on all browsers on that computer, then it is not a browser problem and there is not need to change browser settings. All of which means that @terdon's answer is probably the correct one. Do read the post from his third item before doing anything else. – Hennes Mar 19 '13 at 13:48
  • @Hennes The error comes in all PC which are in same network. In other network website opens properly. – IT researcher Mar 20 '13 at 05:23
  • Do you have a dynamic IP (e.g. might the IP you are using now been in use by someone else, potentially someone whose computer was infected with a virus?). – Hennes Mar 20 '13 at 12:50
  • Have you contacted the system administrator as suggested? – MattBianco Aug 04 '14 at 13:31
  • This is happening to me as well, except I don't get that message in Safari (no Ad Block installed), but I do get it in Firefox and Chrome (Ad Block installed). Safari indicates the site is "Not Secure". There is no info for system admin. – calycolor Jan 27 '21 at 23:38

3 Answers3

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Your computer is probably infected with malware which is being detected by an IPS. You should scan your computer for malware and viruses.

  1. Run a complete virus scan. I assume you have an antivirus program installed, if not GET ONE!

  2. Also check for other malware, for example using this.

  3. There is a very good thread on SU on how o clean your machine, I recommend you read it.

Community
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terdon
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This appears because the server you are accessing is configured to prevent too many accesses within certain time periods. i.e. no more than 5 hits in 10 seconds and no more than 30 hits in 300 seconds.

If the IPS is "simple" it will be quite efficient at generating false positives and blacklisting legitimate users. The most common occurrences are when multiple users accessing the site from one IP address, through home connection with NAT.

Extract from a Fortinet router config file :

config system replacemsg nac-quar "nac-quar-ips"
    set buffer "<html><head><title>Attack Detected</title></head><body><font size=2><table width=\"100%\"><tr><td bgcolor=#3300cc align=\"center\" colspan=2><font color=#ffffff><b>Blocked because of IPS attack</b></font></td></tr></table><br><br>An attack was detected, originating from your system. Please contact the system administrator.<br><br><hr></font></body></html>"
    set header http
    set format html
end

Most times such messages originate from false positives. Sometimes the addition of AJAX calls on a website increase such false positives due to increased page requests.

Coyote
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This is due to IP blacklist check whether your IP is blacklisted or not ,another reason is the site is not avilable in your region and the site owner is not allowing your country and they simple block the IP

jacob justin
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