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Questions tagged [firewalls]

Concerned with software or hardware firewalls

2
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0answers
48 views

How can Nmap bypass Windows Server firewall rules?

I need to block all communication (inbound/outbound) from server A to server B (all ports/all protocols). Server A should communicate with every machine except server B. I can't place firewall rules ...
-1
votes
1answer
35 views

Infection of malware

Lets say, My firewall is configured to block any incoming connections My browser doesnt allow any traces and scripts I have vpn on My browser always asks before downloading files My browser doesn't ...
1
vote
0answers
28 views

UFW (Uncomplicated Firewall) Question

I was wondering if there's any benefit of adding following rules to a Raspberry-Pi directly exposed to the internet: sudo ufw deny to 0.0.0.0/8 && sudo ufw deny to 169.254.0.0/16 && ...
0
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0answers
19 views

Anonymous configuration for racoon

My firewall alerted me of a connection attempt via racoon, the IKE key management daemon to set up an IPSec tunnel. It was clear that when I looked up the IP address 122.228.10.51 this was suspicious. ...
0
votes
1answer
42 views

IDS and IPS placement in network? [duplicate]

What is the good practice for the placement of IDS (NIDS) and IPS? Before the firewall or after the firewall? and why?
0
votes
0answers
45 views

Why is my firewall rule being ignored? [migrated]

I'm having difficulty getting the firewall on a Draytek Vigor 3220 to pass incoming connections to port 25. I've set a rule to pass TCP packets from WAN to LAN from any source IP address and port to ...
0
votes
0answers
16 views

Gateway firewall basics & managing multiple elastic IPs to non-http services

I've been trying to make sense of this for months now. If this is too broad, or more appropriate for another forum please say so. I would appreciate at least a lead to documentation, as I simply ...
2
votes
2answers
82 views

How are stateless firewalls useful in public cloud platforms?

I'm trying to understand the value of stateless firewalls in public cloud platforms like Network Access Control Lists (NACL) in Amazon Web Services (AWS). I think I know a few ways I can use them, but ...
3
votes
2answers
81 views

How IDS and Firewall Logs are aggregated and feed aggregated log to SIEM?

I am studying SIEM tools. Firewall logs will be different from IDS logs and even from Antivirus logs. How can log aggregation take place?
0
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0answers
4 views

Restricting ssh and ftp access to unix server [migrated]

I know I can restrict ssh and ftp access to my unix server by using tools like ufw (uncomplicated firewall). What if I restrict ssh and ftp access to one IP address (my home IP) and then suddenly lose ...
1
vote
2answers
94 views

Can an ISP limit what security software (firewall) that will work?

My ISP (JCOM) says that McAfee is the only security software that will work with them. Is that true? The system is running Windows 7 Home Premium Japanese Version. The McAfee system is provided by ...
1
vote
1answer
85 views

Being connected to a trusted VPN, do I still need personal firewall, and if so, why?

Background Hardware: Dell Inspiron 15 Gaming 7577-92774 with recent BIOS (16-Aug-2018) Operating System: Windows 10 Pro, version 1803 (Build 17134.285) Antivirus / Firewall: ESET Smart Security ...
0
votes
2answers
102 views

Have firewall and VPN already, should I buy a mini router to protect my laptop?

I often travel for business and use hotel wifi. I have installed Little Snitch and VPN-Outline for internet security. Should I buy a mini router? Will it keep my computer safer? Otherwise,with or ...
68
votes
5answers
10k views

Advised to block all traffic to/from specific IP addresses

My CFO received an email from a director at a financial institution advising that all traffic (inbound and outbound) from certain IP addresses should be blocked at the firewall. The director at the ...
-1
votes
1answer
133 views

What are the Pros & Cons of VPN server behind or in front of firewall? [closed]

What are the pros and cons of a VPN server behind or in front of the firewall? There seems to be no right or wrong in either option. An example of the VPN server in front of the firewall:
0
votes
1answer
61 views

Is it advisable to accept STUN server connections?

My firewall reports outgoing connection attempts via com.apple.WebKit.Networking to a number of STUN servers (namely, stun.nas.net, stun.node4.co.uk, stun.voxox.com and stun.wwdl.net). This is ...
0
votes
0answers
64 views

Azure SQL Database and corporate networks

I have question around DLP from a corporate network. I have a Virtual Machine on a corporate network. The VM can access an Azure SQL DB in the cloud: aaa.database.windows.net However, I don't want ...
-2
votes
2answers
214 views

Why is DDOS is one of the most common Cyber-Attack? [closed]

Based on some articles and some research DDOS is one of the most common cyber-attack. There are tonnes of articles out there about the DDOS subject, including describing, mitigating, the question "...
1
vote
2answers
40 views

Do I need Gateway Firewall for IoT network? [closed]

Do I need a gateway firewall to prevent attacks like DoS, if my IoT network can only talk to cloud using IPsec? Even if there is need that can be implemented at cloud. Is there any need for it to ...
1
vote
2answers
108 views

Am I being Hacked? So many defferent ip's in router firewall logs [duplicate]

My router dsl light was not stable; It keept disconnecting and connecting..So I logged into Router Homepage to check whats wrong and found there were so many different ip's in Router firewall logs I ...
0
votes
3answers
116 views

Is It More Secure to Use Firewalls from Two Different Vendors?

The topic is "Is It More Secure to Use Firewalls from Two Different Vendors " Is not much safer using a multi-vendor firewall because "More than 95% of firewall breaches are caused by firewall ...
1
vote
1answer
163 views

The role of Machine Learning In Cybersecurity Defense [closed]

Hackers and malware are one step ahead of cybersecurity experts, and every time technology is released to the market, vulnerabilities will be quickly discovered and exploited. How effective can ...
0
votes
1answer
79 views

Root CA or Intermediate CA in firewall trust store

I am implementing a PKI for a test environment and have everything just about configured. The architecture consists of a Root CA, two issuing (intermediate CAs), and clients. Client certificates and ...
2
votes
2answers
50 views

Network provider blocking URL, even though connection made to IP

I came across an interesting case today, which with my limited knowledge I'm unable to understand the working of. I was trying to access a bit.ly link, but it is blocked by my University. Knowing ...
0
votes
1answer
32 views

Telling the difference between firewall block or external problem with Page Cannot be Displayed (IE) [on hold]

In our organization, when users run up against the firewall in Internet Explorer, this is what they see: The classic IE "Page Cannot Be Displayed". Of course, this is also what you see when it's ...
1
vote
0answers
33 views

Are parts of my system susceptible to IP based malicious attack even with effective IPtables rules?

Yesterday I installed Cent OS 6 and had to flush the default IPtables rules (IPtables -F) in order to access a web app via my browser. Having very little experience with Linux/Network security this ...
0
votes
0answers
39 views

was PC attached? ARP spoofing, MITM, hacking, etc?

Been wanting to post this since months. Around mid March while as usual on my work PC running Windows 7, the screen blinked for a second while everything was running normally, it did this a few times, ...
0
votes
1answer
62 views

Differentiating between IKEv2 and OpenVPN Traffic

There is a WiFi network that I regularly use, and it seems to be blocking all VPN traffic other than IKEv2. I tested this by downloading many of the free/freemium VPN apps from the Google Play Store ...
0
votes
1answer
61 views

Would it be possible for a malicious user to change the LAN IP address of an uncompromised device?

I have a local network and an IPCam (with its own storage) in it. Due to some practical limitations, I cannot use technologies such as AP isolation or VLAN to isolate low-integrity and high-integrity ...
1
vote
1answer
76 views

Could an attacker spoof a whitelisted IP to access the network?

There is a network that is protected with a firewall and only one IP is whitelisted. Assuming the attacker knows the whitelisted IP, what would prevent an attacker from sending traffic via a spoofed ...
0
votes
2answers
135 views

Is an ACL Sufficient for business firewall?

I am a relatively new IT specialist for a small company (about 30 employees, 100 more seasonal.) Most of our systems have been outsourced to an IT company long ago, that handles licensing, VDI, PBX, ...
1
vote
1answer
80 views

Refusal to 'open' up corporate network?

I am working a project which requires access to a service running on a remote server, over a single TCP port (>1024). This service runs on a machine located within an existing network, and the project ...
2
votes
3answers
81 views

Whitelisting DNS vs. Packet filtering Firewall

I am an information security intern for a MSP. The company is set up to work remotely a few days a week. As I was gathering information for the assessment, I found out that one of the employees does ...
0
votes
2answers
676 views

Can a hacker hack into port 80?

We normally say port 80 is firewall friendly. But can a hacker just hack into port 80 via TCP or UDP? Or is Port 80 by default not always open? It waits for the host to initiate a connection via ...
1
vote
2answers
378 views

Should I allow communication on public networks?

I apologize if this is a newb question. Reading this prompt, it appears that I should check Private Networks and uncheck Public Networks. However, Windows defaults to the opposite being checked. Am I ...
3
votes
1answer
846 views

Is it dangerous to disable the IPv6 firewall built into many home routers?

The router that my ISP has delivered contains an IPv6 firewall. The only configuration option is whether it is on or off. Apparently, this firewall simply denies all incoming connections. I ...
0
votes
1answer
223 views

Comparison between WAF and IPS/IDS

I would like to know the difference between WAF and IPS/IDS? Can IPS/IDS handle an attack on a web application? If there are differences functionally between the two applications, how they work ...
0
votes
3answers
279 views

How did EternalBlue bypass firewalls?

I've tried recently to run the EternalBlue exploit via metasploit (on VirtualBox lan), and I've spotted that if the victim PC uses the most naive windows-firewall than the attack would fail. That got ...
0
votes
3answers
233 views

Are there any feasible ways to block the stunnel utility at the network level?

The stunnel utility written by Michał Trojnara allows, if I understand correctly, to "wrap" non-SSL protocols (such as ssh) in an SSL connection. For example, imagine that all network ports on a ...
5
votes
1answer
163 views

How to eradicate and recover a compromised network

I have a somewhat broad question related to a specific, ongoing threat that I am trying to define and defend against. Right now, I need to rebuild a secure access point for my mobile devices and ...
4
votes
3answers
179 views

Should network firewall rules be secret?

At my workplace only the security team have access to see the rules on the server network firewalls. Developers and system engineers don't have any visibility, so they just deploy applications to ...
0
votes
1answer
300 views

Firewall doesn't support TLS 1.2

I have an ASA 5550 firewall that doesn't support TLS 1.2. What impact would we have when the older protocols are disabled? Will this affect the servers at all?
0
votes
1answer
48 views

Limited remote access to a web application [closed]

I would like to set up a very simple node.js web application on raspberry pi and access it remotely, from outside the LAN. There are no other hosts in that LAN with the Raspberry. I only need to ...
1
vote
0answers
77 views

How to block all aplications from internet connection?

I would like to block all windows10 applications from internet access So I found a settings screen on the windows firewall (Windows Firewall\Allowed apps) I would like to uncheck everything from this ...
1
vote
0answers
59 views

Comodo Firewall HIPS (Paranoid Mode) Regedits

Old time lurker and odd poster here with a general question. I think this might fall more in the nature of understanding system processes. I've activated comodo HIPS on paranoid mode to firstly see ...
0
votes
3answers
125 views

Get data without Firewall detection

I was browsing through some cyber security questions and I came across a question that kept sticking in my mind so I figured maybe I just ask here. The question is: What is a way to get data from ...
0
votes
1answer
158 views

Find out the IP or hostname of the firewall? [closed]

Is there a way to find the IP of the firewall which is blocking my access to an endpoint? I tried netcat / nmap but not much luck. I need some form of a tool which does a traceroute to the subnet or ...
2
votes
1answer
75 views

UFW appears to block connections from remote address, but NAT is disabled on my router

I'd like to understand what the following line means exactly, because similar lines can by found in my system log pretty often and I would not expect any. [UFW BLOCK] IN=enp2s0 OUT= MAC=72:8a:bd:21:...
2
votes
2answers
184 views

Router Security Log Shows Many Blocked TCP Connections

When checking my router tonight I looked at its security log. I saw thousands of blocked tcp traffic. Why are these considered security events? The log shows many blocked tcp incoming request from ...
0
votes
2answers
55 views

Concept using ssh to create dynamic firewall. Good or Bad idea?

The Goal Create a secure process to open a firewall port on a server (on demand), start a listening server, and ultimately close the firewall port. This would improve security by not always having a ...