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• Server Security

  - by mahatmanich

  I want to run my own root server (directly accessible from the web without a hardware firewall) with debian lenny, apache2, php5, mysql, postfix MTA, sftp (based on ssh) and maybe dns server. What measures/software would you recomend, and why, to secure this server down and minimalize the attack vector? Webapplications aside ... This is what I have so far: iptables (for gen. packet filtering) fail2ban (brute force attack defense) ssh (chang default, port disable root access) modsecurity - is really clumsy and a pain (any alternative here?) ?Sudo why should I use it? what is the advantage to normal user handling thinking about greensql for mysql www.greensql.net is tripwire worth looking at? snort? What am I missing? What is hot and what is not? Best practices? I like "KISS" - Keep it simple secure, I know it would be nice! Thanks in advance ...

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• Ironport X-Junk header.

  - by Kyle

  My school uses Ironport for filtering/monitoring web traffic. I have a bit of curiosity as to why it tacks on a x-junk: header onto everything. After going through a few curl tests, I've found no real connection between what is shown on the page and the x-junk: header. here's my curl request: any ideas? Anchorage:~ khotchkiss$ curl -I google.com HTTP/1.1 301 Moved Permanently Location: http://www.google.com/ Content-Type: text/html; charset=UTF-8 Date: Sun, 06 Feb 2011 04:37:25 GMT Expires: Tue, 08 Mar 2011 04:37:25 GMT Cache-Control: public, max-age=2592000 Server: gws X-XSS-Protection: 1; mode=block Content-Length: 219 Age: 108 Via: 1.1 MC-IRONPORT.UNIVERSITY.LIBERTY.EDU:80 (IronPort-WSA/6.3.3-015) Connection: keep-alive X-Junk: xxxxxxxxxxxxxxxxxxxxxxx

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• Ubuntu not connecting to network in Hyper-V

  - by soandos

  I am unable to connect the Ubuntu guest (both 12.10 and 12.04) to the internet via hyper-V. Here is what I have done so far (with much thanks due to @Kronos's blog post on the topic): Created a switch in the switch manager with connection set to external, selected my wifi card (Intel Centrino Ultimate-N 6300 AGN). If it matters, the Microsoft Filtering Platform is checked under extensions. Added this switch to my Ubuntu guest. I also tried a different wireless card (Aethros 9285) same issue. Connecting through my wired card works just fine (assume that I select that card, and I am wired in of course). Making it a legacy network adapter does not fix the issue. Ubuntu can see this connection, but is unable to connect to it. What follows is what I attempted to do to get Ubuntu to connect: Start and restart the network manager Restart the machine Verify that it could in fact see the adapter (resulted in device not ready a few times) How can I get this to work properly?

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• Barracuda spam filter alternative - virtualization/appliance friendly?

  - by ewwhite

  I've sold and deployed Barracuda spam and web filters for years. I've always thought that the functionality was good (Barracuda Central, easy interface, effective filtering), but the hardware on the entry to midrange units is a weak point. They have single power supplies, no RAID and limited monitoring support. Personally, I think Barracuda would make a killing selling their software as a VMWare appliance, but I'm looking for something similar that I can deploy as a consultant, but will be easy for customers to manage. It should have support for server-grade hardware or the ability to be deployed as a virtual machine. Is there anything out there that's close?

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

  - by Chris S

  This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? There are so many techniques and so much to know about fighting SPAM. What widely used techniques and technologies are available to Administrator, Domain Owners, and End Users to help keep the junk out of our inboxes? We're looking for an answer that covers different tech from various angles. The accepted answer should include a variety of technologies (eg SPF/SenderID, DomainKeys/DKIM, Graylisting, DNS RBLs, Reputation Services, Filtering Software [SpamAssassin, etc]); best practices (eg mail on Port 25 should never be allowed to relay, Port 587 should be used; etc), terminology (eg, Open Relay, Backscatter, MSA/MTA/MUA, Spam/Ham), and possibly other techniques.

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• "Fast link detected" warning in GP management console

  - by ???????? ??????

  There is a message that is shown in every report i make in Group Policy Results section of Group Policy Management Console, saying that "A fast link is detected". I followed the link in the waring, but after I read the page several times, I concluded, that I can ignore the warning. However, I noticed that the group policies are not applied when security filtering is used untl "gpupdate /sync" is executed... Is this related to the fast sync? In general, can somebody explain me the consequences of fast links briefly?

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• What's the difference between a Table and a Named Range in Excel 2007?

  - by technomalogical

  Can someone explain the difference between Tables and Named Ranges in Excel 2007? It seems that in addition to having the features of Named Ranges, they're somehow marked as Tables which gives them special formatting & filtering options in the ribbon. Other questions: Can I treat a table as a named range? Does a named range provide me any functionality not offered by a table, and vice versa? Should I use one over the other (assuming that consumers of the spreadsheet are using Excel 2007 or higher)? Google has not been helpful (excel difference between named range and table and excel 2007 difference between named range and table) and I've found one resource describing table functionality, but no reference to named ranges.

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• Handling Junk Email with Apple Mail.app and Gmail

  - by Axeva

  I've just setup my Apple Mail client to work with Google Apps through IMAP. One lingering question is how to best handle SPAM (Junk Mail), however. In their Help section, Google recommends that we disable junk filtering on the client. http://mail.google.com/support/bin/answer.py?answer=78892 This leads me to wonder what we should do when a junk message makes it past Google's filter? Do I just delete the message? If I do, the Google spam filter will never improve and "learn" that the message was junk. Do I have to log in to the web interface at Google to mark the message as spam? That seems a bit arduous for every spam email I get. What's the best way to handle this? Thanks!

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• Proxy Appliance

  - by Kumar

  I'm looking for a way to set-up a web proxy at home. Hopefully there's a solution I can use to do this. Alternatively, do you have any ideas for setting up one at home using a proxy with an auto updating list? UPDATE - AutoUpdating list so the new sites are categorized and downloaded and the filtering is done by category instead of per site e.g. peerblock works this way Appliance as in a small dedicated hardware or device to perform this task, like WD TV live or Acer Aspire Revo with the media center edition I'd be ok with setting up Squid / Linux / SquidGuard even if i'm not familiar with *nix but ideally a small form factor pc with dual nic's would be ideal so it can be out of sight for the most part !

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• Wife's Email going into Junk Mail folder in Outlook despite turning off Junk Mail

  - by Adam V

  I recently started a new job. Today I tried emailing my wife from my new company email account. When she responded, her email went into the "Junk E-mail" folder. So I tried a few things: Added her to the "Safe Senders" list Added her as an Outlook contact and checked the "Also trust email from my Contacts" box in the "Safe Senders" tab Added her domain to the "Safe Senders" list Switched from "Low" to "No Automatic Filtering" in the Junk Email options No matter what I would do, her emails would still go into the Junk Email folder. Can anyone recommend additional things to try? EDIT: This is using Exchange.

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• Bridging VirtualBox over OpenVPN TAC adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• What is Causing this IIS 7 Web Service Sporadic Connectivity Error?

  - by dpalau

  On sporadic occasions we receive the following error when attempting to call an .asmx web service from a .Net client application: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." By sporadic I mean that it might occur zero, once every few days, or a half-dozen times a day for some users. It will never occur for the first web service call of a user. And the subsequent (usually the same) call will always work immediately after the failure. The failures happen across a variety of methods in the service and usually happens between 15-20 seconds (according to the log) from the time of the request. Looking in the IIS site log for the particular call will show one or the other of the following windows error codes: 121: The semaphore timeout period has elapsed. 1236: The network connection was aborted by the local system. Some additional environment details: Running on internal network web farm consisting of two servers running IIS7 on Windows Server 2008 OS. These problems did not occur when running in an older IIS6 web farm of three servers running on Windows Server 2003 (and we use a single IIS6/2003 instance for our development and staging environments with no issues). EDIT: Also, all of these server instances are VMWare virtual machines, not sure if that is a surprise anymore or not. The web service is a .Net 2.0/3.5 compiled .asmx web service that has its own application pool (.Net 2.0, integrated pipeline). Only has Windows Authentication enabled. We have another web service on the farm that uses the same physical path as the primary service, the only difference being that Basic Authentication is enabled. This is used for a portion of our ERP system. Have tried using the same and different application pool - no effect on the error. This site isn't hit as often as the primary site and has never had an error. As mentioned, the error will only happen when called from the .Net client - not from other applications. The client application is always creating a new web service object for each request and setting the service credentials to System.Net.CredentialCache.DefaultCredentials. The application is either deployed locally to a client or run in a Citrix server session. Those users running in Citrix doesn't seem to experience the issue, only locally deployed clients. The Citrix servers and the web farm are located in the same physical location and are located in the same IP range (10.67.xx.xx). Locally deployed clients experiencing the error are located elsewhere (10.105.xx.xx, 10.31.xx.xx). I've checked the OS logs to see if I can see any problems but nothing really sticks out. EDIT: Actually, I myself just ran into the error a little bit ago. I decided to check out the logs again and saw that there was a Security log entry of "Audit Failure" at the 'same' time (IIS log entry at 1:39:59, event log entry at 1:39:50). Not sure if this is a coincidence or not, I'll have to check out the logs of previous errors. I'm probably grasping for straws but the details: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7/8/2009 1:39:50 PM Event ID: 5159 Task Category: Filtering Platform Connection Level: Information Keywords: Audit Failure User: N/A Computer: is071019.<**.net Description: The Windows Filtering Platform has blocked a bind to a local port. Application Information: Process ID: 1260 Application Name: \device\harddiskvolume1\windows\system32\svchost.exe Network Information: Source Address: 0.0.0.0 Source Port: 54802 Protocol: 17 Filter Information: Filter Run-Time ID: 0 Layer Name: Resource Assignment Layer Run-Time ID: 36 I've also tried to use Failed Request Tracing in IIS7 but the service call never actually gets to where FRT can capture it (even though the failure is logged in the web service log). The network infrastructure group said they checked out the DNS and any NIC settings are correct so there is no 'flapping'. Everything pans out. I'm not sure that they checked out any domain controller servers though to see if that could be an issue. Any ideas? Or any other debugging strategies to get to the bottom of this? I'm just the developer in charge of the software and don't really have the knowledge on what to investigate from the networking side of things - although it does sound like a networking issue to me based on what is happening. Thanks in advance for any help.

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• Is the view history in Firefox 3.6.3 broken or is there an "undocumented feature"?

  - by Lirik

  Firefox View History Before Firefox 3.6.3 when I clicked Ctrl+H it would display my browsing history and I would be able to search it, sort it by Most Visited, Last Visited, etc. Since 3.6.3 I have been having issues: Firefox does not display any entries when filtering by Most Visited or Last Visited. Searching does not work regardless of what keyword I use (i.e. if I type stackoverflow it won't even find it, although it's one of the most visited web sites in my history). Is anybody experiencing similar problems? Are there any known issues that might be causing the problems that I'm seeing?

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• Sharp flat panel scaling with Nvidia drivers

  - by Brecht Machiels

  I have a Samsung 226BW flat panel with a 1680x1050 native resolution. As my PC is rather dated (Athlon XP 2600+ and GeForce 6600 GT), I need to run more recent games (but still old) on a lower resolution. Unfortunately, scaling low resolutions to 1680x1050 results in a very blurry image (bilinear scaling). I have created a custom resolution of 840x525 in the Nvidia control panel. Technically, this resolutions allows perfect upscaling to 1680x1050 without the need for bilinear interpolation. Unfortunately, the Nvidia driver always seems to do bilinear scaling, again resulting in a blurry image. However, I seem to remember that I did obtain crisp images using this resolution in the past (before a Windows re-install). Maybe only some driver versions support integer upscaling without bilinear filtering? Or perhaps there are other solutions?

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• Ping isn't acting accurate?

  - by Earlz

  I've been trying to diagnose some latency issues with my internet connection. I've been lagging out of online video games and such, which of course could be their server's fault. So, I've been running ping some. It doesn't indicate anything unusual, but it does act a bit strange. I can start it with something like ping internethost -i 0.1 so that it will send a ton of packets, and every 10-20 seconds it will appear to just freeze for 2 or 3 seconds. The packets are still being received in the right order though, and there is no packet loss. The weirdest thing is that after the little freeze up, it will usually just report a ping time that is about 10-30ms higher than the average. How does this happen? Is ping still being accurate? I'm using Arch Linux. The host I'm pinging is my website, which shouldn't be doing any kind of ping slowing or filtering.

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• Using Xbox 360 controller with Mac OS X (specifically turning it off)

  - by Bob King

  So I've been using this driver for a few months with the Xbox 360 Wireless Controller For Windows with my Mac Mini. Here's an article about the driver on Gizmodo. The driver works really well for actually using the controller, but there doesn't seem to be a way to power off the controller without pulling the batteries. Does anyone know of a replacement driver that includes power-off capabilities, or know of some other undocumented way to turn the controller off? Note: I've been having problems getting to the site, but it could be our corporate filtering.

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• How difficult is it to setup a mailserver?

  - by Jacob R

  I want a secure mail solution, as I am looking to move away from Google and other parties looking into my private data. How much of a PITA is it to setup my own mailserver? Should I go for an external provider with a good privacy policy and encrypted data instead? I have a VPS running Debian (with a dedicated IP + reverse DNS), and I'm a fairly capable Linux administrator, having setup a couple of webservers, home networks, and looking over the shoulder of sysadmins at work. The security I currently have on the VPS is limited to iptables and installing/running the bare minimum of what I need (currently basically irssi and lighttpd). When setting up a mail server, is there a lot of stuff to take into consideration? Will my outgoing mail be marked as spam on other servers if I don't implement a number of solutions? Will reliable spam filtering be difficult to setup? Can I easily encrypt the stored mail?

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• Unable to outside access service from inside LAN

  - by erotsppa

  I have a weird port forwarding problem. I tried to open my port 22 to the outside network. I was able to access it as long as I am not inside the LAN. I can access it from my office for example. But from within the LAN, I can access the port using the local ip, but I can't access the port using the external IP. It's as if the router is blocking the loopback. I've check all my router settings, turned off anything firewall/filtering related. Any ideas?

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• DNS error only in IE

  - by Le_Quack

  Our Intranet page has stopped working on some machines/some user accounts. The error I am getting points to a DNS issue but If I ping the site from the command line the it responds fine. The error I'm gettting on IE is Error: The web filter could not find the address for the requested site Why are you seeing this: The system is unable too determine the IP address of intranet.example.com I'm not quite sure why it mentions the web filter as there is a proxy exception for the intranet page and if I run a trace route it doesn't go via the web proxy (filtering system). Finally it isn't affecting everyone, just random users, also it doesn't affect the random users on all the client machines they use. I have one user where it happens on any client they log onto where most its just certian clients. It's even "fixed" itself for a few peoples. EDIT: hey Mikey thanks for the fast response. Proxies are correct and automatic configuration is off (both via GPO)

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• How can I apply a DSP to my microphone in windows?

  - by user16315

  I'd like to be able to run my microphone through arbitrary DSP filters--Mostly for compression and amplification, but also noise cancelation would be nice. I'd then like to take that output and put it back in a virtual audio device that I could use as input for skype, mumble, teamspeak, or any other VOIP program. With a program like Virtual Audio cable, I can do the 'fake devices' part but as far as I know it does not allow any kind of filtering inline. Does a program like this exist? Or some combination of programs that can be combined to accomplish this?

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• Any good PostgreSQL client for linux?

  - by senotrusov

  stackoverflow points me "belongs-on-serverfault" on this, so crossposting. I am frustrated of not having a good Linux GUI administration and development tool for PostgreSQL. pgAdmin III is buggy and unusable piece of... hmm, software, compared to Windows-only PostgreSQL Maestro and EMS PostgreSQL manager. phpPgaAmin does not looks promising. EMS PostgreSQL manager can work under Wine, but such setup have a number of issues. Requirements are: Table data editing and browsing for large tables (1M+), able to jump by FK or some master-slave editing, GUI filtering and so on. ER diagrams with in-place schema editing Schema editing and browsing with all useful GUI support Schema changes log to put into DB versioning (migrations script). Tabbed interface to be able to work with a number of tables and SQL queries at once. And so on. Any ideas?

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• eMail with Conflicting Headers not blocked in MS365

  - by John Meredith Langstaff

  On occasion, a company receives eMail with two header fields (“Received” and “From”) containing data that contradict each other drastically. Should they not expect their anti-spam system to flag or block items with contradictions in these fields? For example, they received an eMail which contained [almost exactly] these two headers: Received: from [107.52.51.26] by web315204.mail.ne1.yahoo.com via HTTP; Mon,28 Oct 2013 04:28:04 PDT From: Barry Smith [email protected] Obviously, eMail from an @att.net address isn’t coming from a server on the domain yahoo.com, and Yahoo isn’t forwarding AT&T’s eMail. There were no other headers indicating that the item was sent “OnBehalfOf”, or “Forwarded-by”, or “By_Proxy” or any other such. Should I write a utility to scan incoming eMail for such conflicts, or look more closely at their spam filtering to block this kind of eMail? Their eMail system is Hosted Exchange on MS-365. My central question is, where specifically do I look in MS-365 to get this type of conflicted eMail blocked?

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• Server 2008 blue screen after login - no desktop

  - by Jake

  I came into work today to find that our Windows Server 2008 used as a terminal server for the Thin Clients was not loading the users desktops. What I have found out is that when I login via Remote Desktop, after applying user settings, it gets to the stage of 'Preaparing your desktop', but then the screen just goes blue. I have tried rebooting several times with no luck, and logging in locally at the server with no luck. Does anyone have any suggestions? I do not think that it could be a virus attack as we run antivirus on the server with OpenDNS filtering. Yesterday a software restriction policy was set up to only allow programs in the following directories to run if that could be the problem, although it was working fine all day yesterday. C:\program files C:\programdata C:\windows Thank you. Jake

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• Apple Mail doesn't apply rules unless I choose "Apply Rules" manually

  - by porneL

  I'm using Apple Mail with IMAP account. I have several filtering rules defined. The problem is that Mail doesn't apply them automatically to incoming email. Even spam isn't filtered automatically. For all incoming email, every time, I have to select e-mails and select "Apply Rules", and then rules work fine (that one time on selected e-mails only). It works like this on two separate installs of Mail with different accounts (both IMAP though). How can I get Mail to apply all rules automatically every time to all e-mails? I wonder does it ignore rules because of misconfiguation, bug or does Apple seriously expect people to use "Apply Rules" menu item regularly?

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