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Questions tagged [firewall]

A Firewall is an application or hardware device used to inspect and filter network traffic.

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How do I detect TCP requests coming from my linux machine getting stopped by a firewall?

I have an application that is getting blocked by a firewall but not logging failures to any type of log. I've since opened the hole in the firewall, but is there a good way to see what the actual request is so I can figured out why this happened in…
Alex Argo
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Cannot connect to remote MySQL server (RDS)

When I am trying to connect to RDS from my vps, it says connection refused. When I tried connecting it from local or other vps, it worked fine. I figured out that it must be a firewall issue on my vps. sudo iptables -L Chain INPUT (policy…
nirvair
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How to write IPTables policy to affect multiple ranges in a group?

I am trying to block the entire Internet on all ports, but allow a multiple ranges to connect on specific ports. I want this ruleset to apply to outbound connections as well (using REJECT instead of DROP) as to prevent identification…
Josh
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Increasing firewall throughput but constant traffic

I can't understand, why the firewall throughput of my server is significant increasing during the last few days while everything else, including traffic, remains on it's normal level. What scenario can result in stable traffic but increasing…
Hubert Schölnast
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Server IP is showing Firewall IP

From server 2008 r2, I check "what is my IP address", instead of showing my server IP, it showed my Firewall IP. How to rectify this.
VL Thlan
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UFW blocks permitted ports

I use ufw utility to manage my firewall for the system which runs web and mail services. The rules are follow: Status: active To Action From -- ------ ---- 22/tcp ALLOW …
Ver
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Route traffic in a public network

I have 3 stand alone CentOS servers on same hosting provider. The hosting company can't offer me a firewall for this devices, only iptables. So I want to buy another server and make this server a firewall (and some monitoring tools like Snort) for…
antiks
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Scalable remote access gateway for 20K+ servers

Consider a worldwide distribution of thousands of embedded servers, and clusters of servers behind firewalls that sysadmin wants to access remotely. With a focus on a remote access for login and diagnostic operations, reverse-proxy or vpns could…
awoz
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Need Required Active Directory Ports for Isolated Environment

We have a 100% isolated environment that needs to communicate with our AD infrastructure outside the isolated environment. I need to know all the ports and whether they're incoming or outgoing. These are the ports I've gathered so far. Can anyone…
user335185
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Can't connect to VNC server via OpenVPN

I've got the problem with connecting via VNC to remote computer. Connection goes through OpenVPN and I'm routing 5900 port to localhost.. ssh -p(port) -L5900:vpn adress of machine:5900 user@server.example and then viewing by Remmina at my computer…
beather4N
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app runs much slower on VPN

I have an app that accesses the internal network at work. I can run it from home via VPN but when I do, it runs much slower. I suspect that it is getting timeouts caused by the firewall and somehow recovering. Is there a utility I can run on my…
JoelFan
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Can't manage / ping Sonicwall's LAN interface from across MPLS

We have two of our sites connected via an MPLS that bypasses our firewall. Traffic between the sites, when hitting our core switch is routed directly to a second interface on our ISP's router. The one thing we could never figure out how to fix is…
Geoff
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Check if IP address is allowed through firewall

Our cloud service requires that the client's server allow specific IP addresses be whitelisted in their firewall. If the IPs aren't whitelisted, the end users will experience issues, but the end users don't typically know if an IP address is…
Nick Syrax
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Azure VM instance IP firewall

I assigned an instance-level IP address to my Azure VM. I then configured the SSH "endpoint" from the Azure portal and defined a deny-all policy. However, this policy seems to only affect the cloud service VIP, and not the instance-level IP which is…
blizz
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ASA 5505 blocks users

I have recently installed an ASA 5505. But now i have users that are being blocked/kicked from the internet. What can i do to prevent this? Here is the running config: Result of the command: "sh run" : Saved :ASA Version 9.0(1) ! hostname…
Kris Henriksen
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