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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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• 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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• 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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• 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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• Citadel mail server software non-DIY alternatives

  - by microspino

  I have ha VPS on webbynode with Citadel groupware suite installed, but I'm not so happy with It. I would like to try other alternatives. This is a VPS where I do tons of experiment so it's better for me to avoid any DIY solution if not extremely easy to reinstall. In fact I destroy and rebuild this VPS frequently. I just need a mail server, with spam filtering and web access. No goupware features needed. Please don't suggest me to pass through gmail. :) Could you provide me 2 or 3 alternatives?

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• How do i find out what's preventing delete requests from working in iis7.5 and iis8?

  - by Simon

  Our site has an MVC Rest API. Recently, both the live servers and my development machine stopped accepting DELETE requests, instead returning a 501 Not Implemented response. On my development machine, which is Windows 7 running IIS7.5, the solution was to add these lines to our Web.config, under system.webServer / handlers: <remove name="ExtensionlessUrlHandler-Integrated-4.0" /> ... <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE" type="System.Web.Handlers.TransferRequestHandler" resourceType="Unspecified" requireAccess="Script" preCondition="integratedMode,runtimeVersionv4.0" /> However, this didn't work on any of our live servers; not on Sever 2008 + IIS7.5 and not on Server 2012 + IIS8. There are no verbs set up in Request Filtering, and WebDAV is not installed on any of our live servers. The error page gives no further information, and nothing gets recorded in the logs. How do I find out what's preventing DELETE requests from working in iis7.5 and iis8?

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• E-mail addresses with plus sign in MS Exchange

  - by Wilson

  Many users like to use e-mail address in the format "[user]+[tag]@[domain]" to facilitate local filtering of incoming messages. The semantics of that is that the message should be delivered to the mailbox belonging to "user"; the user would advertise his/her address with different tags to different potential senders and would then be able to filter incoming messages according to sender (and also to track who got the e-mail address from where). The question is: is it possible to get MS Exchange (2007) to deliver messages in this format properly? If so, how exactly? Internet searches seem to imply it is not a possibility...

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• Implementing Variable Envelope Return Path (VERP) using Exchange

  - by iammichael

  We're looking into implementing Variable Envelope Return Path (VERP) for improved bounce processing for our application. Our current mail infrastructure is MS Exchange 2007 but are in the process of upgrading to 2010. We're also implementing Postini for spam filtering. Exchange doesn't support sub-addressing (see also this question on disposable addresses) -- and VERP is somewhat of a specialized application of sub-addressing. Are there any options for implementing VERP in Exchange without putting another non-Exchange SMTP relay in front of Exchange to pre-process incoming messages? Specifically could a transport rule be created that could match against the target (non-existing) recipient, store that recipient address in a special header added to the message, and redirect the message to a pre-created mailbox? Note: we have developer resources available if custom code could be used somehow.

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• Return cell reference as result of if statement with vlookups.

  - by EMJ

  I have two sets of data in excel. One contains a set of data which represents the initial step of a process. The other set of data represents the additional steps which take place after the first step is completed. Each of the data records in the "additional step data" has an id in a column. I need to find the identifying codes of the "additional step data" which correspond with the initial step data records. The problem is that I have to match the data in 4 columns between the two data sets and return the id of the "additional step data". I started by doing a combination of an if and vlookup functions, but I got stuck when I tried to figure out how to get the if statement to reference the id of the matching "additional step data". Basically I am trying to avoid having to search by manually filtering between two sets of data and finding corresponding records. Does anyone have any idea about how to do this?

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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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• Disable mod_security on Dreamhost, for a single cgi script

  - by Hippyjim

  Hi I've searched around a lot, and tried various tweaks to .htaccess files to try to turn off mod_security for a particular cgi script (uber uploader) but it doesn't seem to have any effect. The most popular one I see rehashed all over the web is: # Turn off mod_security filtering. SecFilterEngine Off # The below probably isn't needed, # but better safe than sorry. SecFilterScanPOST Off Which looks relative simple to me - if "SecFilterEngine" is in some way related to mod_security of course. Shame it has absolutely no effect! Does anyone have a suggested way I can simply disable it for a request to any file in my cgi-bin directory?

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• Postfix - how to redirect email if they will rejecting?

  - by Bartosz Kowalczyk

  I have problem with spam and postfix + postgray. It generally good works but I have false-positive still and reject good email. And now I have problems. Can I configure postfix (and postgray) that: if_reject than redirect to [email protected] (change recipients). Or I don't know maybe: Each email have to copy and send to [email protected] Then filtering? If hit restriction than just reject (another copy is in [email protected]) How to do it? Sorry for my english. Can you help me? Thank you

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• In Excel, given a worksheet "A", how do you create a sheet "B" that has a subset of the rows in "A"?

  - by user32706

  In Excel 2007, I have a sheet full of data "A". One of the columns in sheet "B" is called "Valid" and has either "yes" or "no". I've created a second sheet "B". It's easy to make each row in "A" appear in "B" if the row is valid using an 'if' statement in each cell. But if it's invalid, there's a blank row. I need "B" to show only the rows from "A" that are valid. TWO BIG CAVEATS: - No macros - No filtering (for long and complicated reasons). I feel like it might be possible with vlookup used cleverly, but so far, I'm stumped.

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• Finding out if an IP address is static or dynamic?

  - by Joshua

  I run a large bulletin board and I get spammers every now and again. My moderation team does a good job filtering them out but every time I IP ban them they seem to come back (I'm pretty sure it's the same person on some occasions, as the post patterns are exactly the same as are the usernames) but I'm afraid to ban them by IP address every time. If they are on a dynamic IP address, I could be banning innocent users later down the line when they try to get to my forum through SERPs, but if I ban only via static IPs I know that I'm only banning that one person. So, is there a way to properly determine if an IP address is static or dynamic? Thanks.

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• Make browsing safe for porn surfers

  - by Brett G

  At several places I've done some work at, I have a suspicion that some of the executives browse porn on their work computers. It appears this porn surfing has lead to virus infections on their computers despite the presence of an anti-virus. Filtering theses specific users' browsing is not an option, so what would be my next best solution be? I put Firefox + Adblock pro on their computers. I'm tempted to add NoScript, but I'm worried they'll start calling when noscript interferes with browsing on legit websites. Is there anything else I can due to mitigate this risk?

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• Juniper SRX1400 VPN

  - by ank

  I have been trying to set up a client VPN on a Juniper SRX1400 without much success. All documentation I found from Juniper and elsewhere does a lot of other (difficult and wonderful) things other than the simple things I want to do. We already have a VPN running on CISCO PIX hardware which we need to put to rest and we pretty much like to replicate the functionality, which is: 1) client makes a request to the outside interface of the SRX1400, 2) client gets authenticated, 3) if successful, then client is assigned all the usual DHCP stuff and becomes part of the network. What privileges this DHCP assigned network has, should be configurable of course with the usual routing/filtering methods. Am I asking for too much from the SRX for this kind of thing? Should I ditch the SRX for VPN and revert to an OpenVPN solution that I had working some time back also and was amazed at the ease of configuration, functionality and features?

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• Netboot Intel Macs without BSDP

  - by notpeter

  I have a netboot setup with DeployStudio that works great in my lab, but doesn't work on our main network. After some digging, I believe it's because our network admins are filtering BSDP (Boot Service Discovery Protocol) on our subnet at the switch level. Is it possible to hard code which server my clients (early 2007 iMac Core2Duos) should boot from without relying on BSDP? Perhaps relevant details: I do not have control over switch configs or DHCP settings. Client and server are running 10.6 Snow Leopard. The clients see the netboot server advertising itself in the 'Startup Disk' system preferences pane, but when I go to netboot it just leaves me with a flashing globe.

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• What is the method to reset the Planar 1910m monitor?

  - by Richard J Foster

  My monitor (a Planar, apparently model number PL1910M) is not working. (It is flashing a green / orange sequence which I believe to be an error code. The sequence, in case it helps consists of orange and green three times quickly followed by a longer orange, then another green followed by a long period where both colors appear to be present). I vaguely recall a co-worker suffering from a similar problem, and our IT department "resetting" the monitor by holding down a certain set of keys as they apply power. Unfortunately, I do not remember what that key sequence was, our IT department is not responding, and the Planar web site is blocked by the content filtering firewall we have in place! What is the sequence to perform the reset? (For bonus geek-credit, what does the code mean... as if it indicates a blown component clearly a reset will not help me. ;-))

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• kvm -net only passing broadcast, multicast, and guest destination traffic

  - by user52874

  Figured this out just last week, but I can't find it now. Even printed it out. Can't find that either. Frustrating...so...help! Configured a 'monitoring' nic on a kvm guest (running 'Security Onion, if it matters). I read (somewhere) that the default nic configuration for a kvm guest is to only pass broadcast traffic, multicast traffic, and traffic with the guest's mac as a destination. There is an option to override this behaviour, and pass all traffic. It's something like --mac-filtering=no, or --mac-restriction=no, or something like that. Worked beautifully. Does this look at all familiar to anyone who can clue me in to the exact option syntax? thx.

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• How to troubleshoot a remote wmi query/access failure?

  - by Roman

  I'm using Powershell to query a remote computer in a domain for a wmi object, eg: "gwmi -computer test -class win32_bios". I get this error message: Value does not fall within the expected range Executing the query local under the same user works fine. It seems to happen on both windows 2003 and also 2008 systems. The user that runs the shell has admin rights on the local and remote server. I checked wmi and dcom permissions as far as I know how to do this, they seem to be the same on a server where it works, and another where it does not. I think it is not a network issue, all ports are open that are needed, and it also happens within the same subnet. When sniffing the traffic we see the following errors: RPC: c/o Alter Cont Resp: Call=0x2 Assoc Grp=0x4E4E Xmit=0x16D0 Recv=0x16D0 Warning: GssAPIMechanism is not found, either caused by not reassembled, conversation off or filtering. And an errormessage from Kerberos: Kerberos: KRB_ERROR - KDC_ERR_BADOPTION (13) The option code in the packet is 0x40830000 Any idea what I should look into?

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• Recommending simple appliance for DansGuardian, iptables, snort inline

  - by SRobertJames

  I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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