Program to detect a remote firewall

In other words, the IP protocol moves the raw data from one computer to other, using the IP address to identify each computer of the network. Well, but when the data arrives to the destination computer, where must it be left? Are you browsing the WEB? Are you using an FTP client? The TCP protocol redirects the incoming data through the port used by the service 2. As you can see, the port and service concepts are the basic principles used during data transfer through the Internet.

If you want to know what are the services currently running on a remote host, you must scan its ports. The sample code presented here is only an example of Winsock programming. Do not think it like the best approach to the scan topical. As you know, the Winsock API can be used with three different modes, blocking, non- blocking and asyncronous modes. Our scanner uses the third asyncronous mode.

Probably this is not the best mode which can be used with this topical maybe using the blocking mode into a separate thread guarantees a better result , but this is not the point. Commercial scanners use a lot of threads to scan as fast as possible the mayor number of ports at the same time. This is not our purpose. Our scanner must scan one port at time, without blocking the UI until the work is done, and to do it in that way, the best approach is the asyncronous mode, used here to practice and exercise with the Winsock API.

Of course, you are free to modify the proposed code to apply the Winsock mode you prefer. All the code contained into the sample project can be divided into two sections, the simple framework used to build a CProperty. Sheet based MFC application and the classes used for the Winsock interface. The CProperty. MFC application.

Winsock API in asyncronous mode, while the rest of the code is used internally to handle the list control CList. As you can see looking into the code, the CWinsock class is used to map all the Winsock services to the real library or to a dummy implementation, depending on the.

App class from the CWin. Our scanner is not dialog, but property sheet- based, so you must override the default Init. App: :Init. Instance void. The Apply and the Help buttons are removed by the framework, so each page of the property sheet has only the OK and the Cancel buttons. Each page of the sheet modifies the text of the OK button, according to its needs. How can I programatically detect if the ports are blocked so I can display a message to the user on the potential problem?

To detect if the ports are blocked - on Win7 you can view the Window Firewall logs by opening Windows Firewall - click Advanced Settings on the left-side and then open the Monitoring branch. I have researched in the past and there are utilities out there to do this for you, however, at the end of the day it's just a standard format log file.

I doubt that the firewall will mention that it's blocking the application, otherwise intruder can have a information on what's preventing him to access the system Usually, firewalls logs attempts to connect from and to the computer, successful or not, you can check it. If you received none for certain amount of time, then you can safely say that there's a problem in the connection. How are we doing? Please help us improve Stack Overflow.

Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Detect if windows firewall is blocking my program Ask Question. Asked 10 years, 5 months ago. Active 1 year, 3 months ago. Viewed 26k times. Improve this question. Web Web 1, 2 2 gold badges 21 21 silver badges 36 36 bronze badges.

Add a comment. Active Oldest Votes. Improve this answer. Learn why people trust wikiHow. Download Article Explore this Article parts. Tips and Warnings. Related Articles. Article Summary. Part 1. Disconnect your computer from the internet. If you believe someone is accessing your computer remotely, disconnect the computer from the internet. This includes removing any Ethernet cables and turning off your Wi-Fi connections. Some of the more obvious signs of active intrusion would be your mouse moving without your control, apps opening in front of your eyes, or files actively being deleted.

However, not all pop-ups should be concerning--many apps that update automatically can generate pop-ups during the update process. Slow internet or unfamiliar programs are not necessarily the result of someone gaining remote access to your computer. Check the list of recently accessed files and apps.

Both Windows PCs and Macs make it easy to view a list of the last files you've accessed, as well as your most recently-used apps. If you see something unfamiliar in these lists, someone may have access to your computer.

At the bottom of the main panel, check the section called "Recent files" to see if there's anything you don't recognize. You can also view recently-opened apps at the top of the Start menu. Mac: Click the Apple menu at the top-left corner of the screen and select Recent Items. You can now click Applications to see recently-used apps, Documents to see files, and Servers to see a list of remote outgoing connections.

Open your Task Manager or Activity Monitor. These utilities can help you determine what is currently running on your computer. Mac — Open the Applications folder in Finder, double-click the Utilities folder, and then double-click Activity Monitor.

Look for remote access programs in your list of running programs. Now that Task Manager or Activity Monitor is open, check the list of currently-running programs, as well as any programs that look unfamiliar or suspicious. Look for any programs that seem suspicious or that you don't recognize either. You can perform a web search for the process name if you aren't sure what a program is. Look for unusually high CPU usage.

You'll see this in the Task Manager or the Activity Monitor. While high CPU usage is common, and is not indicative of an attack, high CPU usage while you're not using your computer could indicate that processes are running in the background, which you may have not authorized.

Be aware that high CPU usage could just be a program updating or a torrent downloading in the background that you forgot about.

Scan your computer for viruses and malware. Malware is typically the easiest way for hackers to infiltrate your personal computer. If you don't have an antivirus, download an installer on another computer and transfer it to your computer via USB. Install the antivirus and then run a scan with it. Quarantine any items that are found. If your anti-virus or anti-Malware detects any items during the scan, quarantining them will prevent them from affecting your system more.

Download and run the Malwarebytes Anti-Rootkit Beta. This will detect and remove "rootkits," which are malicious programs that exist deep in your system files. The program will scan your computer, which may take a while to complete. Monitor your computer after removing any malware. Change all of your passwords. You should avoid using the same password for multiple services. Log out of everything everywhere. After changing your passwords, go through each account and log off completely.

Make sure that you log out of any device that is currently using the account. This will ensure that your new passwords will take effect and others will not be able to use the old ones. Perform a full system wipe if you can't get rid of the intrusion. If you're still experiencing intrusions, or are concerned that you may still be infected, the only way to be sure is to completely wipe your system and reinstall your operating system.

You'll need to back up any important data first, as everything will be deleted and reset. When backing up any data from an infected machine, make sure to scan each file before backing it up. There's always a chance that reintroducing an old file can lead to a re-infection. See Wipe Clean a Computer and Start Over for instructions on formatting your Windows or Mac computer and reinstalling the operating system. Part 2. Keep your antivirus and antimalware software up-to-date.

An up-to-date antivirus program will detect most attacks before they can happen. Windows comes with a program called Windows Defender that is a competent antivirus that updates automatically and works in the background. There are also several free programs available, such as BitDefender, avast! You only need one antivirus program installed. Windows Defender is an effective antivirus software that comes pre-installed on Windows computers.

See Install an Antivirus for instructions on installing an antivirus program if you don't want to use Defender. Windows Defender will automatically deactivate if you install another antivirus program. Make sure your firewall is properly configured.