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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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Iptables firewall causing instability

I've made a script to set an iptables firewall,but it's Causing instability on the local network aplication . The firewall is droping the connection between the clients and the server for a while when client and server are connected. My network…
lipesmile
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unable to connect to webserver from LAN (access from outside is fine)

We would like to give both our customers and coworkers a single link (subdomain.ourdomain.com) to access a common web application. I set up a web server on a machine connected to LAN, it's accessible from any workstation inside our LAN using its ip.…
user360216
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Overwriting Cisco ASA config using only console access

I'd like to be able to apply a pre-written config to a Cisco ASA 5505, but presently I only have access to it via the serial console and not over the network. Various sources suggest pasting the config into the terminal when in Global Configuration…
dbr
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Can I retrieve email marked as rejected in the SMTP log?

I am using a Sophos UTM 9 SG210 firewall and noticed in the SMTP log that a formerly trusted sender has had 50 legitimate emails rejected. I've since added them to an exemption list, but was wondering if there is any way to retrieve those rejected…
Penanghill
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Cisco ASA 5505 Issue - "Flags SYN on interface.."

I've been trying to remotely configure a Cisco ASA 5505 in front of a dedicated server hosted with OVH. Unfortunately my qualifications and even experience very rarely touched on Firewalls. However I went ahead and gave it a go, honestly I thought I…
Marc Hilton
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TC not classifying packets correctly based on iptables MARK

I have machineA that is connected to the internet via eth0. MachineB on the other hand is connected to machineA through a mesh and is connected to the internet via machineA. I am trying to give lower priority to the traffic coming from machine…
Ogoose
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Sonicwall TZ205 with EnGenius ESB300 as Guest Wireless AP, Need to keep networks apart

I have a SonicWall TZ205 with an EnGenius ESB300 as a Guest Wireless AP. I would like to keep these networks segregated. Interface X0 is the LAN, X1 is WAN and the EnGenius is connected to X4 in AP Router mode. The LAN subnet is 192.168.1.0 and is…
icecarver
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Access Point Iptable/Route rule for allowing device discovery? Devices can connect manually, but not automatically. Multicast/Upnp issue?

I setup a wireless access point on my server and for some reason, everything works but automatic discovery features. I can't see any other devices, upnp devives aren't discovered, and I think it's a simple iptable or route issue I'm…
CREW
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How can I check that the firewall is disabled for a TUN/TAP interface?

while trying to diagnose a UDP multcast issue on an OpenVPN client configuration and I've come across this block in the config file: # Use the same setting as you are using on # the server. # On most systems, the VPN will not function # unless you…
Louis Thibault
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cisco asa public server nat issue

I have been tasked with some ASA configuration coming in a few weeks, and to test out some configuration options I have setup a web server on my local network which I would like to be able to access from via WAN with one of our static IP that ISP…
While-E
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On Cisco firewall, show access-list main rules only (with line numbers)

For example, if I do a sh access-list Lets say I have a rule on line 2 that has one object-group to another object-group connected on X ports. Well, there may be 30 lines below that, that all say line 2 and shows the specific details of each…
Patrick
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MySQL on Ubuntu. 10061 error on 3306

A fresh install of Ubuntu inside of a Virtualbox with LAMP option selected. I am unable to connect to the server via telnet on this port or via ODBC from my host machine. I can ping and SSH both remotely and locally. To start I tried flushing…
Ken Ash
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RPC Server is unavailable while trying to promote a domain controller. Open firewall

So I've been scratching my head around this problem for a few days now. This is a quick schema of our infrastructure : Our Primary Domain Controller is running in an hypervisor, in our datacenter. There are two stacks of firewalls (Fortigate FG200D…
Matthieu ANTOINE
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How to isolate two containers connected to the same bridge?

I have several LXD containers which are bound to a single bridge (the default lxdbr0 or another one, it does not matter). The host itself has another two interfaces, one ultimately connecting it to Internet and another one to which a WiFi AP is…
WoJ
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Not able to RDP to the VM which is part of new subnet in Azure virtual network

Here are my environment detail I am using Azure IaaS (Infrastructure as Service) I am having one vNet (Virtual Network) I have set-up site to site connectivity (on-premise to azure) I have one subnet and couple of VMs in in it. (VM01 and VM02) I am…
kudlatiger
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