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

learn more… | top users | synonyms

1
vote
0answers
88 views

Windows Server spamming devices on other subnets on port 445

I have a Windows Server 2012 that every few seconds sends packets destined for port 445 on local IPs on other subnets. The IPs on other subnets it is trying to reach are devices such as VoIP phones, ...
1
vote
0answers
671 views

Fortigate 60D - Empty log and report

Environment: Fortigate 60D Forti OS 5.0 I can not see any log or report in the firewall. I have already activated forticloud and I recieve empty reports. Is there something that we have to ...
1
vote
0answers
18 views

Can a firewall handle packets being sent to it by a network TAP?

We have the intention of examining incoming mails for security purposes. In order to do so we figured out the solution will include: Network TAP - To copy all SMTP traffic to the firewall Firewall - ...
1
vote
0answers
234 views

Apache blocking based on combination of ip, request and useragent - Can fail2ban do that?

3 times over the past 48 hours, we had about a 6X spike in traffic lasting a few hours. The server handled it each time, but just barely. This was almost all bad-bot traffic (or maybe failed DOS ...
1
vote
0answers
33 views

Why did BFD add euid=0 to APF IP deny_host.rules?

Trimming down some old deny_hosts today and I noticed this one: # added euid=0 on 11/03/14 11:00:04 with comment: {bfd.sshd} euid=0 Anyone know why the BFD would have added euid=0 root/permissions ...
1
vote
0answers
192 views

Windows firewall blocking network shares through VPN server

I have a VPN server in front of a 172.16.0.0/24 network. On my client side is a 192.168.1.0/24 network. I am able to successfully VPN in to the server network from the client, and I am trying to ...
1
vote
0answers
258 views

amazon ec2 instance going to a remote ip using openswan tunnel is up but no traffic being established on the remote ip

I having establishing a vpn tunnel to a remote peer/public ip using amazon ec2 openswan. The tunnel is up but no traffic has been seen on our side or the remote side? Is there I been missing? Please ...
1
vote
0answers
550 views

Dynamic IP Blocking on FORTIGATE 200A Firewall

I have FORTIGATE 200A firewall protecting a IIS Server running a ASP.NET website (windows server 2008 and IIS7) I'm not familiar with Fortigate configurations and options. I recently had "attacks" ...
1
vote
0answers
145 views

Dovecot/Postfix mail server replies to [SYN] with [RST, ACK] when user attempts to connect (POP3). Likely iptables?

Currently I am trying to trouble shoot an e-mail server that will allow users to send e-mail, but not log in to the server (POP3) or receive e-mail using their Outlook clients. Previously this was ...
1
vote
0answers
76 views

PF rule for Continuity

So it looks like the Continuity on OS X 10.10 creates network interface on the fly (utun2 here) and my PF blocks it, so that I can't make/answer calls. I'm not an admin, just use the IceFloor for PF ...
1
vote
0answers
412 views

NoVNC being blocked behind firewall, how can I find the port being blocked?

We have an OpenStack cloud running internally and wanted to allow student's access to the NoVNC console from within Openstack's Horizon web panel. Everything work's internally however after adding ...
1
vote
0answers
356 views

Is it advisable to disable URL Path Length restrictions from firewall?

I noticed in early August that I was unable to get to SharePoint Online sites, most Microsoft Update pages, Microsoft Support pages, Microsoft.com, etc. as they all appeared to be returning a blank ...
1
vote
0answers
144 views

`ufw insert 1 deny to any` not working

ufw insert 1 deny to any ufw enable ufw status Status output: Status: active Logging: on (high) Default: deny (incoming), allow (outgoing), disabled (routed) New profiles: skip To ...
1
vote
0answers
175 views

Windows Server 2003 Outbound ftp Very Slow with Windows Firewall enabled

From Windows Server 2003, I'm uploading a file (~50MB) every day at 4:00am to my hosting space in the cloud. I'm doing it by calling "ftp -s:" in a batch file that a Scheduled Task runs. I did what ...
1
vote
0answers
3k views

VPN pptp connection Unable to pass through linux iptables

I have set up a windows VPN server behind Linux - Ubuntu box that is working as firewall and proxy server. Now I want people from outside to be able to connect to the VPN server, but the connection is ...
1
vote
0answers
1k views

ClearOS Proxy - Block all traffic but two sites and 3 DMZ ips

I've been trying to two days now to get ClearOS to do a proxy setup for my network. This is what I need to do: I need to block all outgoing traffic no matter what it is, all ports and HTTPS as well ...
1
vote
0answers
770 views

Shorewall redirect rule only working for some hosts in the same network

I'm trying to use Shorewall's REDIRECT action to intercept traffic destined for the firewall's port 514 (TCP and UDP) to port 5000 (also TCP and UDP), while also allowing direct traffic to the latter ...
1
vote
0answers
266 views

Firewall and NAT settings in GSM modem for one server

I have a GSM Modem (PSI-MODEM-GSM/ETH) in field with one device behind, acting as a server. The situation is as follows: "PC" | \_________Dynamic IP: 10.103.153.122 | ...
1
vote
0answers
373 views

SonicWall NSA2400 after firmware upgrade to 5.9 - not able to log some intrusion prevention/detection statements

After upgrading firmware to 5.9 version I'm not able to log intrusion prevention/detection for statements like PHP CGI Argument Injection, Remote Command Execution, Remote File Inclusion, WEB-ATTACKS, ...
1
vote
0answers
107 views

PF Firewall Rules Help - Block IP Hammering

I'm having an issue where someone is using a VPN / proxy to hammer my server. They will pick on random URL from my website and perform ~20 requests per second to it. Once I ban the IP address, a few ...
1
vote
0answers
722 views

Connecting internet uplink to switch or firewall

While I am using Cisco kit, this isn't really Cisco related, more general network design. In the past I have connected internet connections straight in to a layer 3 core switch, 3750X's, 6509's and ...
1
vote
0answers
2k views

Cisco ASA 5510 multiple vlans on same interface with different security levels and routing between

Looking to setup on my 0/3 interface multiple vlans and looking to get confirmation that this will work. Ethernet 0/3.1 security-level 20 nameif dev-dmz vlan 502 ip address 172.20.2.1 255.255....
1
vote
0answers
414 views

Exclude an IP address from an openwrt firewall rule

I am using a wrt54gl with openwrt to try and redirect all traffic on my LAN to a specific server, which will run scapy and other network analysis tools and act as a gateway/firewall to the Internet. ...
1
vote
0answers
181 views

Microsoft Forefront TMG, IIS and SQL server on one server

We have a Windows 2008 VPS with IIS and SQL Server, hosted by a provider. We use it for hosting web applications on the Internet. The only firewall we can use is Windows firewall. I would like to have ...
1
vote
0answers
112 views

LDAP Integration with the firewall

I am trying to integrate Sonicwall NSA2400 with AD so users can VPN with their domain credentials and able to change password if it expires. Do i need to install ADLS role and configure LDAP, or LDAP ...
1
vote
0answers
67 views

Can IPtables (possibly with libnetfilter_queue library) do everything that snort does?

I have just started getting into network security, firewall, etc. So, please excuse me for asking this basic question. I looked at IPtables and got a good hang of it (nowhere close to becoming an ...
1
vote
0answers
2k views

Firewall/iptables rules for GlusterFS

A great pleasure would be to know which exact iptables rules to use for securing GlusterFS 3.4.2 (with Debian Wheezy) in shared environment. I'm running some dedicated servers at ISP. There are two ...
1
vote
0answers
108 views

Mac OS 10.6.8 Firewall Blocking Wiki for ONE User

This is a very bizarre issue that I hope someone can help with. We're running 10.6.8 server to host our internal wiki. We had the firewall enabled on that machine without any issues. Last week one ...
1
vote
0answers
404 views

Vyatta Remote Access VPN firewall (PPTP)

I am using Vyatta Remote Access VPN (PPTP) and NAT for proxy. When pc-A and pc-B are connected to VPN, pc-A ipaddress is 192.168.10.10 and pc-B is 192.168.10.11. [pc-A:192.168.10.10]--internet(VPN)--[...
1
vote
0answers
674 views

Blocking X-forwarded-For IP in fail2ban?

I am using a reverse proxy in front of my web-server. In the web server I installed fail2ban and want to use it to monitor logs and block bad ip. I am using nginx with the http realip module. But ...
1
vote
0answers
147 views

Manual firewall configuration with SuSEfirewall2

I have a Suse server and I want to configure its firewall settings by manually editing the SuSEfirewall2 file (located in /etc/sysconfig/SuSEfirewall2). My goal is to accept only specific services on ...
1
vote
0answers
57 views

Zyxell USG200 NAT for local computer using wan address

My WAN public address is linked to the server with NAT. How can I set up the firewall to let all local computer use the same NAT rules for www.mypublicaddress.com address from INSIDE the network? I ...
1
vote
0answers
165 views

Firewall rules between windows cluster

I have been given the task to define firewall rules between 2 Windows clusters. The first cluster hosts a clustered middleware application and the second cluster hosts SQL Server. The 2 clusters are ...
1
vote
0answers
46 views

How can i manage bandwidht in linux router or firewall?

I have Linux server for internet sharing . i have 6 Mbps bandwidth, Now i want set 30Kbit to 40Kbit per user bandwidth. I want configure without proxy. It is possible that tc configration will ...
1
vote
0answers
251 views

Strange dropped packets coming from port 8888 and with ACK or ACK+PSH set

Background During an incident on a small privative network (1 router/FW + 1 server) my server got accidentally exposed to the internet. Fortunately it was protected by it's own UFW to allow only 1 ...
1
vote
0answers
219 views

CheckPoint Firewall R71: Is it possible to reserve an IP for a specific MAC address on a VPN session?

My Checkpoint firewall is configured to allow users to open the GUI (Smart Dashboard) only if their IP is on the allowed list. Whenever I work from home (I use the CheckPoint SNX client on an Ubuntu ...
1
vote
0answers
134 views

Wireless Bridging two Sonicwall Firewalls

We have two sites (essentially two small buildings side by side but we are unable to run CAT5 cable between them) which are currently linked via a wireless bridge. We will be splitting the sites so ...
1
vote
0answers
70 views

Windows 2k3 IPsec policy. Block all traffic prevents IPSec communication

I'm looking to harden down A Win2k3 server that talks to a branch over an IPsec tunnel based connection. Windows 2k3 firewall doesn't offer control of outbound communications, so I've turned to the ...
1
vote
0answers
83 views

Restrict “open” ethernet traffic to OpenVPN Traffic only when on a certain network

I would like to set up a pf or ipfw firewall rule on my Mac OS X 10.8 notebooks so that all Traffic on wireless and cabled networks is restricted to calling "home" through OpenVPN when I'm not in the ...
1
vote
0answers
1k views

Local transparent proxy with ipfw and squid

I want to use a local transparent proxy to have a single place to enter the password to an office proxy. Basically, all the TCP packets sent to port 80 except the ones sent to specific subnet should ...
1
vote
0answers
521 views

What is Bonjour Linux IPTables Firewall Ports?

I'm trying to configure my iptables in order to allow Pidgin to use Bonjour protocol, now according to: Bonjour for Windows doesn't work due to firewall settings, I have to allow Multicast DNS / (5353/...
1
vote
0answers
416 views

Client can not access some HTTPS through Squeeze gateway

I have a gateway (+firewall +proxy) set up on a Squeeze box with 2 NICs. The problem is the client cannot see some of the HTTPS (for example they can go https://mail.google.com but not https://github....
1
vote
0answers
267 views

Only ICMP traffic allowed inbound on ISA Server 2006

I have recently set up a connection to a remote site. The connection between the sites is done at the ISP level (ie, this is not a B2B tunnel on ISA). I'm fairly lightweight in the networking realm, ...
1
vote
0answers
716 views

Windows Filtering Platform blocking packets for legitimate traffic

I am running into an issue with traffic from a webapp server to a database server being blocked or filtered. I have allowed inbound and outbound traffic on the needed ip and port with a firewall rule, ...
1
vote
0answers
2k views

Puppet agent (v3.0.1) hangs connecting to master (v3.1.1) in VM behind firewall (with NAT based access)

I am using puppet agent v3.0.1 (On FreeBSD), trying to connect to a puppet master v3.1.1 (On Ubuntu) and the puppet agent hangs with the following debug output: puppet agent --debug --no-daemonize ......
1
vote
0answers
31 views

Can I run sharepoint 2007 native report viewer in synchonous mode?

We are hosting a SharePoint MOSS 2007 environment and installed and use the Native Report Viewer with SSRS 2005. All works fine from the LAN, but from internet, the report viewer displayes a page not ...
1
vote
0answers
3k views

Outlook client behind forefront TMG 2010 unable to connect to External Exchange server

Here is my situation. Our office just got sold and we are working on the migration to the new company's environment. Everything has worked fine until the Outlook client's migration. Our firewall is ...
1
vote
0answers
475 views

UDP Range Nat Translation port forwarding RPT Traffic to inside host PBX Cisco ASA 5505 8.2a

I have an Asterisk based PBX that I'm providing VoIP services with, My gateway is a Cisco ASA 5505 running 8.2 and I only have one public IP Available along with other services I provide with that IP. ...
1
vote
0answers
1k views

juniper ssg320 intrazone configration issues Close - AGE OUT

We have one main office and another small office that holds only 5 people. We have recently setup OpenVPN on our main office and created a bridged vpn between our main office LAN and a windows 2003 ...
1
vote
0answers
202 views

CSF: Changing portflood settings to deny IP longer than second interval?

I've recently been under attack and I'm configuring CSF firewall for my Ubuntu server (latest). I found out portflood settings only block the ip for the specified second count, but I would like ...