The tag has no usage guidance.

learn more… | top users | synonyms

1
vote
2answers
8k views

How To Enable URL Filtering With Just Squid & C-ICAP

Before I posted this question, I read several set up guides online, the squid docs, c-icap docus, and also the ICAP RFC (3507). Unfortunately, the documentation for SQUID and C-ICAP does not provide ...
0
votes
2answers
32 views

postfix block mail to a domain only for a specific destination domain

I have a mail server that hosts many virtual domains. The owner of one virtual domain that is on this server asked me to block mails coming from an external domain to his mailboxes. I have this ...
0
votes
2answers
17 views

Will it work to use cPanel's global email filters to create a catch all address? [closed]

Essentially, my cPanel account has 'default address' disabled and we've moved from a hosting company that uses a catchall system to this cpanel account that doesn't. In the process we've also moved ...
0
votes
0answers
15 views

LDAP filter alphanumeric

Does LDAP (precisely Active Directory) allow to filter out only alpha-numeric characters? Client app crashes on some non-printable characters (like vertical tab U+000B), when trying to get AD groups ...
1
vote
2answers
2k views

Prevent DNS responses for specific domain completely

Situation: Server (Win 2008R2) is being used in a DNS (amplification) DDoS attack. Amplification factor is already down to 1: Set the DNS server to non-recursive and removed all root hints -> DNS ...
0
votes
1answer
58 views

Azure VM Unwanted User-Agent Filtering/Blocking

I recently migrated our WP site to a Debian 8 VM running on Azure. Since then, we are unable to process credit card payments through the RedSys payment gateway. It seems that upon successful payment, ...
0
votes
0answers
29 views

VPC router does not route traffic to CSR

I am trying to configure VPC Gateway Redundancy with Cisco Cloud Services Router (CSR). http://www.cisco.com/c/en/us/td/docs/solutions/Hybrid_Cloud/Intercloud/CSR/AWS/CSRAWS/CSRAWS_4.html client1---...
1
vote
1answer
41 views

IPMI only over HTTP

I am actually performing a security review for a customer and I'm being confusing about the IPMI case. If I'm correct, the protocol is flawed by design, thus directly exposing the IPMI service (udp/...
0
votes
0answers
26 views

DNS: check client IP in database, reply different if ip exists in a DB

I'm trying to setup a DNS server that looks for the client IP in a DB, and returns a static IP as result if the client is in fact in the DB. There might be thousands or a couple million of records ...
3
votes
1answer
410 views

Get Computer Object Properties for the list of servers in a file

When I run Get-ADComputer cmdlet, I can view all of the single object's properties, like below. C:\PS>Get-ADComputer "Fabrikam-SRV1" -Properties * AccountExpirationDate : ...
0
votes
3answers
1k views

How to configure linux routing/filtering to send packets out one interface, over a bridge and into another interface on the same box

I'm trying to test a ethernet bridging device. I have multiple ethernet ports on a linux box. I would like to send packets out one interface, say eth0 with IP 192.168.1.1, to another interface, say ...
2
votes
2answers
362 views

IIS only serve requests with hostnames

What is the optimal way to configure IIS to block direct IP access to the server? Direct IP access is only used by malicious scanners that will troll the entire internet by ip looking for vulnerable ...
2
votes
1answer
54 views

Postfix, ruled based filtering independently for each user

I managed to create successfully a white-list sender email filter see: here. My goal now is to have separate filter for each user. I would like to filter out all the emails based on the rules created ...
1
vote
2answers
658 views

Filter HTTPS content & enforce Captive Portal without MITM proxy

My church wants to start providing free WiFi to our guests, but with 2 requirements: Inappropriate content (such as Pornography and Warez) must be filtered out. The end-user must create an account ...
0
votes
1answer
1k views

How to write proper XPath query for filtering certain application pool errors in Windows 2008 R2 Event log (“Applications” section)

does someone know how to write proper XPath query for filtering certain application pool errors in Windows 2008 R2 Event log ("Applications" section)? EventData in XML view from Application eventlog ...
2
votes
1answer
117 views

Postfix replaces “from” when using simple filtering

I'm trying to configure Postfix (on a RHEL 6.5) to modify the content of incoming messages and forward the emails to a remote server. I used a Perl script piped to Postfix to modify the content, and ...
2
votes
2answers
452 views

invoke filtering manually in dovecot+sieve

I've configured dovecot with a sieve filtering (also I've configured roundcube, but this does not matter I think). It's working fine, I've set up some filters. But now I've got a huge unfiltered ...
0
votes
1answer
1k views

Postfix filter outbound mail with allow-only rules

Essentially I only want to allow my CentOS box to send mail to specific addresses (with patterns if possible). Such addresses would be: user@domain.tld user+*@gmail.com (in this instance I am ...
1
vote
1answer
143 views

Mailman Sender Filter RegEx not working

Does anyone have experience with sender filters using regular expressions with Mailman? I use this regex to automatically accept all emails in the form "john.doe@sales.my-domain.de" or "name.name@...
0
votes
1answer
148 views

Filter outgoing mail by X-PHP-Originating-Script for Qmail

I host about 30 websites for clients on a rented server. Customers are often slow to update their Joomla and Wordpress installations. Sites get attacked quite often and I keep getting put on spam ...
2
votes
1answer
86 views

Drop outgoing mail to previously unavailable mailboxes in exim using mysql database

we have a larger community portal which became bigger and bigger over the years but also has some dead accounts. Recently the ip of the server was blacklisted because many mail adresses of the users ...
0
votes
1answer
788 views

How to setup intermediate SMTP mail server / relay to filter outgoing emails

I want to block all outgoing emails except to few whitelisted domains. what are the best ways to go about it? Can I put an intermediate Intranet server which will do filtering based on whitelist and ...
-1
votes
1answer
626 views

OpenVPN, How to filtering client

I have a problem with limiting "client" with my VPN server. I was reading the FAQ about using iptables with disable option client-to-client, but i cannot run it. The question is how correctly allow ...
0
votes
2answers
447 views

Postfix: Filtering Outgoing Mail According to Sender Subnet

I need some specific LAN subnets to send e-mail to only my corporate domain such as printers or kiosks. How it could be possible via Postfix?
2
votes
1answer
220 views

What is the risk in turning off Base Filtering System on Windows Server…?

Let me qualify that I am a developer so I may be naive. I have a program that requires TCP communication on our local network and the box does not need to be secure. I have had some API vendors in the ...
2
votes
1answer
935 views

iptables port forwarding only for a certain range of IP

I'm using LXC containers. Each one of my containers have an ip address in 10.0.3.0/24. I want the packets that come into my host on a certain port to be redirected to a container so I use this rule: ...
1
vote
1answer
368 views

How to filter RSOP to show only modified policies?

Is it possible to view only those elements of GPO that are actually modified/specified? For example, when looking at RSOP for an OU, I have loads of options which are mostly not specified - can I ...
2
votes
2answers
7k views

Wireshark filtering-trying to filter out my own local ip

i'm trying to filter out my ip address(local address) "192.168.5.22" I used "ip.src != 192.168.5.22|| ip.dst !=192.168.5.22"(without quotes) and I keep seeing my address pop up im in a heavy traffic ...
-1
votes
2answers
52 views

How to filter email based on sender address

This is my first post to serverfault, so I hope you excuse me for asking what may seem like an obvious question. I have tried running a few Google searches, but I really don't know where to begin. ...
0
votes
1answer
575 views

Postfix : intercept outgoing email by sender with amavis or custom filter?

we have some outgoing mail server with latest postfix and amavis. I would need to intercept some outgoing email for some given senders and forward them to a "logging" account + the regular receivers. ...
1
vote
1answer
102 views

Given an Amazon Web Service Security Group, how can I find out what the IP's are?

I'm looking at using a cloud service which has an AWS Security group... I've got a hardware firewall and a software firewall. I have no idea how to say: Given that security group, allow any ...
0
votes
1answer
263 views

Squid “refusing connections” with big ACL

I've successfully set up squid and it's working as is should. I'm using "Squidman" on OS X Server (underlying squid version is 3.1.12). However, I want to use squid to block certain porn sites, so I ...
1
vote
1answer
289 views

How to filter TCP packets based on flags using Packet Filter

Well, I didn't know exactly how to ask this question, but I know that you can use the keyword flags to especify which flags you want to filter. According to the documentation of the Packet filter: ...
1
vote
1answer
344 views

php input filtering, unwanted slashes in get and post params

How can I disable input filtering? Here is an example: echo "\$_GET: "; var_dump($_GET); echo "filter.default: "; var_dump(ini_get('filter.default')); echo "filter.default_flags: "; var_dump(...
2
votes
3answers
2k views

Snort Based Firewall

I have not worked with SNORT much or done too much research on this but it sounds possible. If I setup a server and run snort on it. Would it then be possible to route ALL my traffic through it like ...
0
votes
1answer
243 views

Filtering inbound traffic without knowing the destination subnet

I have a linux machine configured as a router with two interfaces facing LAN A and LAN B. I want to filter traffic passing from LAN A to LAN B (inbound traffic) using tcpdump, but I don't have the ...
2
votes
1answer
88 views

In tcpdump filtering is “port” redundant with “tcp”?

Why would one want to force "tcp" in a "tcpdump" filter when using "port", given port numbers are defined in TCP Headers (as opposed to IP) In other words, is tcpdump tcp and port 10000 synonym to ...
1
vote
2answers
2k views

Grep to find lines starting at pattern A until pattern B is matched

I have a log that contains bits like this: [2012-04-16 15:16:43,827: DEBUG/PoolWorker-2] {'feed': {}, 'bozo': 1, 'bozo_exception': URLError(error(110, 'Connection timed out'),), 'entries': []} [2012-...
5
votes
1answer
591 views

Block Google requests to 16k using pf firewall

I'd like to block access to Google search using PF after the threshold of 17500 requests (connection established) in 24h, from a host running FreeBSD 9. What I came up with, after reading pf-faq is ...
4
votes
2answers
1k views

How to set up server side message filters on sendmail/Imap server?

I currently have message filters set up in Thunderbird to put incoming email messages from various sources in appropriate server side folders. Since I envision starting to use a smartphone (Android) ...
0
votes
2answers
245 views

Is it possible to restrict allowed filenames on a NFS share?

In our mixed network the OSX clients like to create resource fork junk on our Linux NFS shares. What I'd like is a server setting much like Sambas veto files-directive to disallow creation of ._* ...
2
votes
1answer
229 views

Windows Server Error Log Filter

How do I filter the Error Log (Windows Server 2008) for errors from one particular website hosted on the server? The site is using a unique Application Pool, and runs under the context of the ...
2
votes
2answers
1k views

Cisco ASA 5505 (8.05): asymmetrical group-policy filter on an L2L IPSec tunnel

I'm trying to find a way to setup a bi-directional L2L IPSec tunnel, but with differing group-policy filter ACLs for both sides. I have the following filter ACL setup, applied, and working on my ...
0
votes
3answers
1k views

Domino 8.5.3: Modify Subject of Incoming Email

I am a newbie in managing and development for Domino. Recently, I have request from other teams at work to set up a filter or agent for incoming mail. This is the requirement for the request: Look ...
1
vote
1answer
355 views

How to remove duplicates in Exim .forward file?

I would like to remove duplicates messages in some mailing-lists (cross-list posting) in my Exim .forward file. I was using procmail before with these commands: :0 Wh: msgid.lock | /usr/bin/formail -...
0
votes
1answer
255 views

how to redirect to different URL? [closed]

I want to redirect the request to my machine to another URL[not IP address]. Is there any way to achieve this using iptables?.. or what is the way to achieve this?..
2
votes
3answers
2k views

ProCurve ACL to prevent a subnet from leaving the switch

I have a single HP ProCurve 2610 in a remote location that is connected in with the rest of the network via SHDSL. There are two Layer-3 networks on this segment. ACLs are setup to deny one subnet (...
-1
votes
1answer
71 views

Trying to colate click fraud evidence [closed]

We've recently had some very heavy and unexpected Google adwords spikes recently, so I'm trying to work through the server logs to find out if we've been subject to click fraud. What I don't know is ...
2
votes
1answer
689 views

Iptables: Filtering only one interface on a router with multiple interfaces

The following are my firewall rules. eth1 is the WAN interface and all other are LAN interfaces. I want to filter INPUT and FORWARD chains only on eth1 (WAN interface). All other interfces need not be ...
1
vote
0answers
451 views

Network Server Cabinets - How does the ventilation work?

Recently I've been looking at a range of network server cabinets with a mesh door at the rear. At the top of the cabinet are ceiling mounted fans with dust filters attached. These fans suck air out of ...