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• How to test if SYN and FIN are both dropped at the same time in hping3?

  - by snow

  One of the rules to prevent unexpected attack is to prevent SYN & FIN being used together. SYN and FIN are both set $IPT -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP How do I use hping to test if this iptable rule works? hping3 192.168.7.0 --keep -S -F??? Is this complete? When just type iptables -L, it shows: Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere DROP tcp -- anywhere anywhere tcp flags:FIN,SYN/FIN,SYN WHY do I need to put the "SYN,FIN" twice before drop? Is it because one for source and one for destination?

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• No Editor in Directory Utility

  - by Christian Macht

  I'm on OSX 10.6.8 and would like to enable the root user. I found Apple's KB article, however this point Click the lock in the Directory Utility window. Enter an administrator account name and password, then click OK. Choose Enable Root User from the Edit menu. is not possible, because there is no "Edit Menu" Icon! I'm logged in as admin, but I only see "Services" and "Search Policy". Repeat, I do not see the "Editor", it's just not there. What gives? How it should be: Directory Utility

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• Windows XP - removing write protection for usb drives

  - by Arnold

  I have a laptop who used to belong to my company and when I plug in a usb memory drive, I cannot write any files to it. This is because company policy did not allow writing to usb drives without a special authorization (to prevent theft of files). However the laptop is now mine, and I was given the administrator password, so I am guessing that as administrator I can remove this protection somehow. How can I do this? Currently if I try to copy a file to the drive, Windows simply tells me that the drive is write-protected, whatever usb drive I plug in. Maybe it is some registry setting? Thank you.

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• What should be taken into consideration when deploying Windows 8 in a domain environment?

  - by GaTechThomas

  Edit: Reformulating the question: We have ordered new laptops but before they arrive, our development team is trying to decide whether to install Windows 8 or stick with Windows 7. We have already tested on isolated machines, but we have not yet been allowed to add the machines to the domain. Before we approach the networking group to discuss adding Windows 8 machines to the domain, we need more information on what changes / issues to expect in moving from Windows 7. Are there any aspects we should consider that are specific to Windows 8 clients? Thus far, I've gotten the following feedback: Windows Administrative Shares are disabled New set of Group Policy templates Changes to proxy server settings Additional items along these lines would be helpful. We're not looking for items related to Windows GUI changes, but instead primarily items related to having the machine live and be used on the domain.

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• Is Centos legal?

  - by Jim B

  I'm trying to figure out if centos is legal (or simply grey). Here's what makes me wonder: They seem to go to great pains not to mention that they are based on redhat in the FAQ they mention a policy about using the redhat trademark, but the link no longer exists. When installing it it's not hard to find a lot of redhat code. I don't bother much with the linux world anymore but I had a client that was wondering about it as his auditors picked up on it and wanted to know where his license was.

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• How much traffic a linux-based shaper would be able to chew

  - by facha

  Hi, everyone I have a linux based traffic shaper (iptables + tc htb policy). It works in bridge mode. Shapes traffic based on IPs and ports (there are about 100 rules in the "mangle" chain of iptables). Right now its throughoutput is about 100 mb/s (I don't remember pps, there are about 800 users in the network). Just was wondering - when I will hit the limit. How much traffic could a linux-based shaper possibly get throuhg it. If you have one under heavy load, please could you write what machine you use and what load there is. Or if you have any other info about the subj, please write as well. Thanks in advance.

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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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• Is there any descent open-source search engine solutions?

  - by Nazariy

  Few weeks ago my friend asked me how hard is it to launch your own search engine service with list of websites that suppose to be crawled time to time. First what come at my mind was Google Custom Search however pricing policy is quite tricky and would drain your budget if you reach 500K queries per year. Another solution I found here was SearchBlox, which can be compared to Google Mini service. It's quite good solution if you planing to cover search over small amount of websites but for larger projects it is not very handy. I also found few other search platforms like Lucene, Hadoop and Xapian which seems to be quite powerful solutions to reach Google search quality, and Nutch as a web crawler. As most of open-source projects they share same problem, luck of comprehensive guidance of usage, examples and it's expected that you are expert in this subject. I'm wondering if any of you using this solutions, which of them would you recommend, and what should I be aware of?

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• Remote desktop sessions - Unwanted automatic log off after period of time

  - by alex

  I'm having an issue whenever I connect to any of our servers via RDP - After a certain period of time, it seems to close these sessions, closing all the applications i had open etc... This is particularly annoying if I am running a long process - for example, copying a file - it cuts it off... I then re-connect via RDP, and it effectively loads a new session. Is this set somewhere in Group Policy? Or somewhere else? This is happening on Windows 2008 (it may also be on our 2003 servers, although I haven't noticed...)

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• deleting old unused images

  - by Ayyash

  As we move on with our content-based websites, lots of images get dumped in our images folder, but we rarely come across self-committed monkyes that delete their files once they do not need it, which means, we end up with a huge list of images in one folder, and it is very tricky to clean it up. My question is (and i dont know if this is the right website to ask it), is there a tool that allows me to find out if an image has been requested by web in the last (n) months? my other general question is, how do you do it? how do you take control of your images folders? what policy do you enforce on developers to clean up? what measures do you take in order to decide what goes and what stays if you end up with an out-of-control situation? my suggestion was to rename the images folder, create a new one, copy the basic ones and wait for someone to complain about a broken image! :) i find this to be the most efficient.

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• How can I suppress /etc/issue without losing error messages?

  - by Andy

  Is it possible to tell the ssh client to not print the connects of /etc/issue to stdout when connecting to a remote host, but to print out any other diagnostic (e.g. error) messages? Either using ssh -q or having LogLevel quiet in ~/.ssh/config suppresses the /etc/issue printing, but also turn off error messages. I've tried touching ~/.hushlogin as well - that stops /etc/motd being printed, but doesn't affect /etc/issue. The most obvious solution is just to remove /etc/issue, but company policy dictates the file be there with dire warnings about unauthorised access. This is non-negotiable. Unfortunately, I've got a bunch of scripts that run across quite a few hosts via ssh, and the log files are a) very large and b) full of legalese. Since quite a lot of stuff runs unattended, I don't want to lose any error messages that are printed.

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• How to distribute email's delivery between 2 or more servers

  - by user181186

  We provide Email Marketing service through our online App. We have about 30 customers. And each one has it's own mailling list (5k to 20k emails each). What we really want is to distribute email's delivery between 2 or more servers. I was wondering What kind of aproach/solutions MailChimp , Constant Contact uses to provide a great service ? use many servers ? many IPs ? Our spam policy suspends ANY user/customer that gets 10% bounced .

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• VPN Connects with local access only

  - by user20102

  I have Windows Server 2008 and I have set up a VPN. When a user logs into their VPN they can not view the internet. It comes up as local access only on the the client PC. On the server when I go to the Network And Sharing Centre it displays (Network) with local and internet below it has the RAS Dial-in interface and it displays as local only there as well. I want all users that connect to my VPN to have internet access (full access). If anyone can help me it would be appreciated. Also I've activated dial-in properties and I've done it via policy who can access the VPN and internet. It still doesn't work, but there is a connection but just local only. Thanks

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• IE6 blocking all intranet cookies.. please help

  - by BillMan

  So today, IE6 just suddenly started blocking cookies in my local intranet. It accepts cookies from the internet zone just fine. I tried overriding all the cookies policies with no help (adding my site, etc). When looking why the cookies are blocked, I get messages saying that "IE couldn't find privacy policy for http://mysite...". This is killing me.. been reading a couple knowledge base articles about deleting registry keys, and nothing has worked. Any help would be appreciated. Probably related, I was using the IE developer toolbar yesterday to test the behavior of browsers with cookies disabled. Now the option to disable cookies just has a "-" next to it. I removed the toolbar to see if that helped.. nothing..

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• Access Denied on a Drive where All Users list have been deleted in Security Tab

  - by darkstar13

  Hi All, (System is Windows 7 x64) I wanted to restrict access of other people in a certain drive of my computer (Harddisk 1 is partitioned to C & D; I want to restrict Drive D). What I did was go to the Security Tab (under Drive Properties) and remove the All Users entry. My account is an administrator account. I left only Systems and Administrator on the list. However, when I tried to access drive D, I got an Access Denied error, and Security Tab is already missing. I tried to edit Local Group Policy; it does not work. Take Ownership is not available for the Drive as well, but I see it enabled if I select files / folders. Please help. Thanks. Also, I am wondering why, as an Administrator, have my access to that drive denied.

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• In ufw is there any way to disable logging for a particular rule?

  - by thomasrutter

  I am using UFW with a default logging policy of "low". I would like to keep this logging on for the default deny action, but disable it for a particular IP address only. So I'd like to create one particular new rule that doesn't have logging. Is there a way to achieve this? I have a rather uncomplicated ufw setup so far, like this: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 22/tcp LIMIT Anywhere 80/tcp ALLOW Anywhere 443/tcp ALLOW Anywhere 22/tcp ALLOW Anywhere (v6) 80/tcp ALLOW Anywhere (v6) 443/tcp ALLOW Anywhere (v6)

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• Applications don't see mapped network drive after waking from sleep

  - by Chris

  I have a network share mapped as a drive letter on a Windows 7 PC that's part of a simple home network. When I wake the PC from sleep, Explorer sometimes says the drive is disconnected. Doubleclicking the drive connects it instantly, as far as Explorer is concerned. But some other applications don't see the drive unless I take additional steps (e.g., navigate to the drive in an "Open..." dialog). Is there any way to get the drive to be connected for all purposes immediately when resuming from standby? I've found the "Always wait for the network at computer startup and logon" item in Group Policy, but I'm not sure what the setting does or whether it would fix this problem. I have network discovery enabled and un-firewalled.

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• Stop external USB keyboard repeating key presses on Vista.

  - by dommer

  We have an infuriating problem with a (Vista/Dell) laptop. When an external (Logitech) USB keyboard is attached to it, it regularly starts repeating key presses. When the user recently deleted an Outlook message, it deleted them all! When typing a message, suddenly it will start repeating the last keypress about 30 times (it varies). It's not a mechanical issue. We've switched the keyboard out four times. Even tried a brand new one one. Every time it's the same. Also, the keyboard works fine on other machines. The problem doesn't arise when the laptop's own keyboard is used - even if the external USB keyboard is still attached. I'm stumped? Any ideas. Not using an external keyboard isn't an option due to our health and safety policy (...don't ask...).

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• How do you manage perl modules on a Debian system?

  - by nagul

  I'd like to know if you have a method for managing perl modules on your Debian system, with respect to the following: Installing new modules Listing of manually installed modules Checking dependencies, and uninstalling modules I have looked at this perlmonks article for background reading: What is the best way to install CPAN modules on Debian? I have previously installed perl modules using the CPAN module. I have also used dh-make-perl in some cases, when following instructions to build other packages that had perl dependencies. I'd like to institute a coherent policy on my machine so I can better manage how and where the modules are installed, and reduce the chance of breaking perl on my system. I would strongly like a system where I can detect and uninstall modules that are no longer being used.

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• I want to replace Windows Server by Samba 4 for authentication purpose [closed]

  - by garden air

  I am using windows Server 2008 in a mediam size organization. I have 200 clients at the moment. I have learn that Samba4 has a remarkable changes for windows clienmts. I want to use Samba 4 to authenticate my windows xp and windows 7 clients machines. In my home based pc I am using vmware to test samba 4. For that purpose I am using CentOS 6.3 with Samab4. Kindly guide me taht it is possible that I replace windows server as a PDC controller and use samba4 to onlu authenticate my clients. I does not want Group Policy only and only authentication . So what u suggest me. Is it good to use samba 4 instaled of windows server. thanks, gardenair

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• 421 Concurrent Connections - Ratelimit from helpdesk to rackspace server

  - by g18c

  We have Kayako helpdesk running on our WHM Linux server. When e-mails come in from customers, notifications are sent out by Kayako to a number of staff whose mailboxes are hosted on Rackspace mail servers. I noticed a large queue in the Exim queued message viewer of WHM - when looking in Exim logs I can see many lines 2012-10-13 20:06:56 1TN72s-0007Cw-1l SMTP error from remote mail server after initial connection: host mx2.emailsrvr.com [173.203.2.32]: 421 Too many concurrent connections from this client. One client email results in about 5 emails to rackspace servers, perhaps 60 emails per 1 hour on average - not a huge amount but enough to cause messages to be rejected when sent in short bursts. In this case ideally if we can limit the connections sent to the rackspace server we can comply with their limit. For our requirements if we send 1 email every10 seconds or so, this would be OK. Messages to all other servers should go through a normal rates, only mx1.emailsrvr.com and mx2.emailsrvr.com should have this connection limit policy applied. Is this possible?

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• Re-streaming RTMP stream

  - by Yvan JANSSENS

  I have a set of local RTMP stream servers in my network, but I want them to be reachable outside. The bandwidth is too narrow to serve multiple clients on the streamservers of my network, so the idea is to pull the local RTMP streams on a computer serving as a gateway, which pushes them on his turn to a hosted streaming provider. It is not possible to let the sources of the stream push their stream directly to the server outside due to network policy restrictions. Scheme of what I'm trying to accomplish: Internal network | External network ------------ ------------ ----------------------- | internal | <---- | Gateway | ------> | streamserver outside| | streams | ------------ ----------------------- ------------ | ^ | | | ----------- | | clients | | ----------- My question now is: which application which can pull a live stream from an RTMP source (Flash Media Server) and push it to another one (Flash Media Server at hosting provider).

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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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• Disable Bing search entirely from IE when using sysprep

  - by takesides

  I'm creating a Windows Server 2012 R2 image for our product (an all-in-one appliance installed on server hardware) and I am having incredible trouble with getting Bing removed from Internet Explorer. Our clients do not want Bing at all, not as a default search, not as a "search from address bar" feature, not in any sense. I've managed to configure everything else that I want in IE using WAIK to generate an unattend XML file but this has me completely stuck. Ideally I want Bing removed from IE altogether but I would make do with it just being completely disabled. I can find no options in either WAIK or Group Policy to configure this as I need it. Any ideas gratefully received.

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• iptables port forwarding troubleshooting

  - by cbmanica

  I'm trying to forward connections on port 18600 to port 9980. I have this in /etc/sysconfig/iptables: # Generated by iptables-save v1.3.5 on Mon Oct 21 18:30:43 2013 *nat :PREROUTING ACCEPT [2:280] :POSTROUTING ACCEPT [12:768] :OUTPUT ACCEPT [12:768] -A PREROUTING -p tcp -m tcp --dport 18600 -j REDIRECT --to-ports 9980 COMMIT # Completed on Mon Oct 21 18:30:43 2013 and /etc/init.d/iptables status shows me this: Table: nat Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 REDIRECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:18600 redir ports 9980 However, I can telnet from localhost to port 9980, but not 18600. What am I missing? (This is a CentOS-based VM.)

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