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• “NT AUTHORITY\ANONYMOUS LOGON” error in Windows 7 (ASP.NET & Web Service)

  - by Tony_Henrich

  I have an asp.net web app which works fine in Windows XP machine in a domain. I am porting it to a Windows 7 stand alone machine. The app uses a web service which makes a call to sql server. The web server (IIS 7.5) and SQL Server are on the same stand alone machine. I enabled Windows authentication for the website and web service. The web service uses a trusted connection connection string. The web service credentials uses System.Net.CredentialCache.DefaultCredentials. I noticed username, password and domainname are blank after the call! The webservice and web site use the 'Classic .NET AppPool' with NetworkServices identity. I am getting an exception "NT AUTHORITY\ANONYMOUS LOGON" in the database call in the web service. I am assuming it's related to the blank credentials. I am expecting ASPNET user to be the security token to the database. Why is this not happening? Did I miss a setting? (Usually this happens when sql server and web server are on two different machines in a domain, delegation & double hopping, but in my case everything is on a dev box)

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• Samba share will not connect (was working yesterday)

  - by David Gard

  I have a CentOS websver with a Samba share set up (\\webserver\websites). I was connected to this share just yesterday without issue, but today my Windows 8 PC will not connect to it. I've also tried making a connection from Windows 7 and Windows XP, all without success. I initially tried restarting my computer, but that did not work. I then tried restarting the Samba service on the webserver (service smb restart), and when that failed I restarted the webserver. All of that was to no avail, and I still cannot connect to the share. The webserver is contactable from my PC (and the others I tried), as the websites it hosts work fine and I'm able to Putty to the server. When connected to the webserver, I can see that Samba is running by using service smb status - service smb status smbd (pid 4685) is running... nmbd (pid 4688) is running... Can anyone please help me to get this share working? Here is my full Samba config (/etc/samba/smb.conf) - [global] workgroup = MYGROUP server string = Samba Server %v log file = /var/log/samba/log.%m max log size = 50 security = user encrypt passwords = yes socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 local master = no [websites] comment = Websites browseable = yes writable = yes path=/var/www/html/ valid users = dgard

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• NAT via iptables and virtual interface

  - by Alex

  I'm trying to implement the following scenario: One VM-host, multiple guest VMs, each one gets its own IP-address (and domain). Our server has only one physical interface, so the intended use is to add virtual interfaces on eth0. To complicate our situation the provider uses port-security on their switches, so I can't run the guest interfaces in bridged mode, because then the switch detects a "spoofed" MAC-address and kills the interface (permanently, forcing me to call the support, which I'm sure will get them a little bit angry the third time ;) ). My first guess was to use iptables and NAT to forward all packages from one virtual interface to another one, but iptables doesn't seem to like virtual interfaces (at least I can't get it to work properly). So my second guess is to use the source IP of the packages to the public interface. Let's assume libvirt creates a virbr0-network with 192.168.100.0/24 and the guest uses 192.168.100.2 as IP-address. This is what I tried to use: iptables -t nat -I PREROUTING --src public_ip_on_eth0:0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.2:80 That doesn't give me the intended results either (accessing the server times out). Is there a way to do what I'm trying to do, or even to route all traffic to a certain IP on a virtual interface to the VM's device?

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• Enter network credentials as part of batch script

  - by Michael

  WinXP: I have several system services that are needed to run some machinery in my lab. The machine these services are running uses a lab login that has administrator rights. Our IS department, unfortunately, has it set up where at some point during the night the login "loses" the privilege level to start/stop these services. The account stays logged in, but the software controlling my hardware becomes unresponsive. In order to get things back up and running, I have to stop the system services and restart them. Because of the security settings, however, I have to re-enter the user password to start the service (even though the user was never logged out). That, I get the "This service cannot be started due to a logon failure" and I have to enter the password. What would be ideal is to have a batch script run before anyone gets into work that stops all of the necessary services, enters the user credentials when prompted, and then restarts them so that everything is ready for first shift to run. I assumed that using the Task Scheduler in Windows would work as it allows you to run batch files with a user's name and password, but this didn't seem to do the trick. With this setup I would arrive to find that all the services are stopped but not started again. (Presumably because the authentication failed.) The batch file is about as simple as it gets, all I have is: net stop "Service1" net stop "Serivce2" etc., then restart in reverse order based on dependency: net start "Service2" net start "Serivce1" What would it take to accomplish what I'm trying to do and restart the services?

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• Weird Apache behaviour and with files again

  - by afifio

  Hi and thanks for stopping by. I have read Weird Apache problem with file, I have read Weird Apache problem with file ...and its not the problem Setup single XAMPP installation on Windows, single windows user, 2HD, 1 is a portable USB. All is fine, until I move the xampp to new portable HD Symptom Old php files - works fine, new one doesnt http://127.0.0.1/Ajax/index.php - yay http://127.0.0.1/test2/t.php - display the source code http://127.0.0.1/Ajax/test2/t.php - display the source code http://127.0.0.1/Ajax/t.php - display the source code Extra Info IIS+MS Web Development stuff, .NET4, Asp, etc is being installed and still hast reboot yet. .htaccess also seems doesnt work Apache2 conf file was modified to Averride All and still it doesnt care. One of the directory supposed to treat .htm as php yet got text, created another directory and edit a phpinfo, still another text, browse to phpmyadmin, viola, works fine Suspect Does Apache honour XP security and permission ? If so, this is a single user computer. Does Apache dont like my new hard disk/new place ? Why it doesnt execute the php in new directory but happily execute in old folder ? Thanks for the riddle answers

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• Should I keep my ex-employer's data?

  - by Jurily

  Following my brief reign as System Monkey, I am now faced with a dilemma: I did successfully create a backup and a test VM, both on my laptop, as no computer at work had enough free disk space. I didn't delete the backup yet, as it's still the only one of its kind in the company's history. The original is running on a hard drive in continuous use since 2006. There is now only one person left at the company, who knows what a backup is, and they're unlikely to hire someone else, for reasons very closely related to my departure. Last time I tried to talk to them about the importance of backups, they thought I was threatening them. Should I keep it? Pros: I get to save people from their own stupidity (the unofficial sysadmin motto, as far as I know) I get to say "I told you so" when they come begging for help, and feel good about it I get to say nice things about myself on my next job interview Nice clean conscience Bonus rep with the appropriate deities Cons: Legal problems: even if I do help them out with it, they might just sue me for keeping it anyway, although given the circumstances I think I have a good case Legal problems: given the nature of the job and their security, if something leaks, I'm a likely target for retaliation Legal problems: whatever else I didn't think about I need more space for porn. Legal problems. What would you do?

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• VPN service into 192 network

  - by tophersmith116

  I'm thinking about setting up a security testing lab. I work on a switched network, and that just makes for unnecessary headaches when doing testing. I'd like to create a 192 network with a few machines inside for DBs and AppServers etc. I will need a pivot machine that connects to both the outer network and the 192 (for automation purposes). But I'd like to be able to connect into the 192 network with my own machine from the outer network as the "attacking" machine (rather than have dedicated attack machines inside the 192 network). Therefore, I'd like to have the pivot server be a VPN server as well, so that my machine can VPN into the 192 network from the outer network. First off, is this even possible? Can I have a single computer with two NICs where a VPN service allows remote connections into the 192? Secondly, I'd like to have multiple outer clients connect to the VPN. Does anyone have any suggestions? I've used Hamachi well before, but I've also seen some good stuff from OpenVPN.

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• Change default profile directory per group

  - by Joel Coel

  Is it possible to force windows to create profiles for members of one active directory group in a different folder from members in another active directory group? The school here uses DeepFreeze to protect public computers. In a nutshell, DeepFreeze prevents all changes to a hard drive such that every time you restart the machine the disk is identical to it was at the time you froze it. This is a bit different than restoring to an image, in that it never really wrote changes to disk in a permanent way in the first place. This has a few advantages over images: faster recover times, and it's easy to thaw the machine for a few minutes to perform maintenance such as windows updates (which can even be automated). DeepFreeze also allows you to configure a "thawspace" partition, where changes are persistent across reboots. One of the weaknesses of DeepFreeze is that you end up needing to create a new profile every time you log in, unless your profile existed at the time the machine was frozen. And even then, any changes you make to your profile while working on a frozen machine are lost. As students have frequent legitimate needs to log in to our classroom machines, there is currently a lot of cleanup involved from time to time in removing their old profiles and changes, so I want to extend DeepFreeze to protect our classroom computers as well as public computers. The problem is that faculty have a real need to keep a stateful profile locally on these classroom computers. The solution I would like to use is to configure Windows via group policy (or even manually, if that's the way I'll have to do it) to place profile folders on the thawspace partition, but only for members of the faculty security group. Is this possible?

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• Hard Drive Compatibility with Motherboard

  - by Wesley

  Here are the current specs to put things in context: ECS P4VXASD2+ V5.0 Intel Pentium 4 Northwood 2.8 GHz 2x 512MB PC2100 DDR266 SDRAM Maxtor DiamondMax 10 250 GB PATA (IDE) HDD Gigabyte 52x CD-ROM NVIDIA TNT2 Pro 16 MB OKIA 300W ATX PSU USB bracket Modem PCI Before, I actually had a 300 GB hard drive installed. However, I read the FAQ for the motherboard and discovered that a maximum of 250 GB hard drive was supported. So I ended up finding the one listed above and put that in. However, upon booting up, I reset the BIOS to defaults and auto-detected all the drives installed. The 250 GB came up as something like 251.0 GB. I didn't think much about it until I tried to boot up a Windows XP installation disc. It booted up successfully and run for about a minute before the computer randomly rebooted. I've made sure that all the jumpers and settings are correct and everything has been installed correctly. I've tried running it without the addons and one stick of RAM but still the same thing. What else could be causing this problem?

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• Give Access to a Subdirectory Without Giving Access to Parent Directories

  - by allquixotic

  I have a scenario involving a Windows file server where the "owner" wants to dole out permissions to a group of users of the following sort: \\server\dir1\dir2\dir3: Read & Execute and Write \\server\dir1\dir2: No permissions. \\server\dir1: No permissions. \\server: Read & Execute To my understanding, it is not possible to do this because Read & Execute permission must be granted to all the parent directories in a directory chain in order for the operating system to be able to "see" the child directories and get to them. Without this permission, you can't even obtain the security context token when trying to access the nested directory, even if you have full access to the subdirectory. We are looking for ways to get around this, without moving the data from \\server\dir1\dir2\dir3 to \\server\dir4. One workaround I thought of, but which I am not sure if it will work, is creating some sort of link or junction \\server\dir4 which is a reference to \\server\dir1\dir2\dir3. I am not sure which of the available options (if any) would work for this purpose if the user does not have Read & Execute permission on \\server\dir1\dir2 or \\server\dir1, but as far as I know, the options are these: NTFS Symbolic Link, Junction, Hard Link. So the questions: Are any of these methods suitable to accomplish my goal? Are there any other methods of linking or indirectly referencing a directory, which I haven't listed above, which might be suitable? Are there any direct solutions that don't involve granting Read & Execute to \\server\dir1 or \\server\dir2 but still allowing access to \\server\dir1\dir2\dir3?

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• "What happens?" server performance monitor

  - by AlexAtNet

  Hello! After reviewing some thread about server monitoring software I end up with a simple question: Which of the server monitoring tools should I use for automatic detection of "abnormal" situations with recommendations on how to fix them? I look for software that checks the system performance after installation and calculate some average load values (memory, CPU, etc). And when something happens (CPU load is increased to 20%) then it tries to detect a reason for this. If it is apache, it should check for access logs. If mysql, it should check mysql logs and tell me what happens. It this is because some user decodes a lot of images, I'd like to know which command is executed, when and user name. The same for disk usage, memory, number of processes, threads and so on. Ideally, this software should periodically checks the system and report problems: errors in PHP error log, outdated packages, security vulnerabilities. In other word I'm looking a software that will keep my simple Debian/Apache/PHP/MySQL server without forcing me to monitor the charts every day. I hope that such program exists. Thanks, Alex

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• "Access is Denied" when executing application from Command Prompt

  - by xpda

  Today when I tried to run an old DOS utility from the XP Command prompt, I got the message "Access is Denied." Then I found that most of the DOS utilities would not run, even though I have "full control" over them. They worked just fine a few weeks ago, and I have not made any OS changes other than Windows Upgrades. Then I tried running edlin.exe and edit.com from the Windows\system32 folder. Same result - "Access is Denied." I tried running these applications from Windows Explorer and got the message "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." I am logged in as a member of Administrators and have full control over these files. I tried logging in as THE Administrator, with no change. I checked the security settings on the files, and have full control over all of them. I have tried copying the files to different drives, booting in safe mode, and running without antivirus and firewall, all with no change. Does anybody know what could cause this?

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• Why are SIP calls via my server silent?

  - by Archcode

  I have FreeSWITCH SIP server up and running. It has public IP and sits behind 1-to-1 NAT (it's Amazon EC2 instance actually). I can connect to it, make a call to other endpoint (namely, my android device to my pc and vice versa) and signals are send with no problems (call, answer, hangup, etc). Unfortunately, and what drives me crazy, that's all: no audio gets through, no video either. Server does not throw errors, it reports many retransmission though, looks like this: switch_rtp.c:915 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=15 Codecs are set up correctly (same config worked locally on my LAN). NAT/firewall on client side may be a problem, signals do get through (perhaps due to fixed port, data streaming runs on random one, that is currently my best bet). STUN/TURN/ICE setting on client seem to have no effect. Endpoints sit behind symmetric NAT. On server there are no iptables rules, security group is set as suggested there: http://wiki.freeswitch.org/wiki/Firewall Help, please. How to make it work or at least diagnose what's wrong?

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• Windows 8 using as a webserver

  - by Jason

  I have a few hobby websites that I currently host on CentOS 6. Apache, mail serving, PHP, MySQL nothing special. In the past I used Windows XP to do this same task, for years, and I was OK. I switched to Linux and for the last few years it has been such a pain. updates break, certain apps only support certain distros without compiling from source. It prevents me from working on my hobby sites more because I am always fixing something. With Windows I locked it down, I run a hardware firewall and packet analyser, kept up on updates and A/V and never had a problem. I dont allow RDC from outside the local LAN, no FTP open, run OpenSSH on an obscure port.. I am considering switching to Windows 8 (since it is a cheaper license now that Windows 7) and running apache, HMailServer, PHP, MySQL, just like my CentOS install. My questions: I am not familiar with Windows 8, can the above be done like XP? No new security restrictions or the OS preventing this from happening? The machine is a Athlon 64-bit X2 with 32GB of RAM. Will Windows 8 see all of the RAM? Technically the machine came with Windows 7, and there is a serial number on it but I am sure I wiped away the Windows 7 recovery partition when I switched to Linux....

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• How can I install .NET framework 3.5 on XP machines without internet connection?

  - by EricSchaefer

  I want to install .NET framework 3.5 on a couple of machines that do not have internet access. If I install the "no internet access"-package it still wants to download something. How can I figure out what is missing? Are there other installation packages? Edit: I would present screenshots but I cannot upload anything from here and the shots would be in german. So I present only the text translated back to english... Installing the "full redistributable package": At the bottom of the license agreement page it display this text: Size of download file: 67 MB Appoximate download time: 2h 44min (56KBit/s) 18min (512KBit/s) It shows the text even if I installed Windows Installer 3.1. After agreeing it displays the "Download and Installation Status"-Dialog with a progress bar labeled "Download:" and Status: Connection to server attempted (try X of 5). Total Download Status: 56MB/67MB I tried it in a VM with no network connection. It tries 5 times while the progress bar shows progress. Later the progress bar is labeled "Installation:". Even later it reports problems during setup and provides two buttons "Send Report Later" and "Don't Send". Now here it comes: "Setup completed" and "Microsoft .NET Framework 3.5 has been deinstalled successfully." (Emphasis is mine) "It is recommended to install current service packs and security updates. More information at Windows Update (link)." Edit2: Installed Service Pack 3, but still no success.

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• Moving a site from IIs6 to IIS7.5

  - by Sukotto

  I need to move a site off of IIS6 (Win Server 2003) and onto IIS7.5 (Win Server 2008) as soon as possible. Preferably tomorrow. The site itself is a delightful mix of classic asp (vbscript) and one-off asp.net (C#) applications (each asp.net app is in its own virtual dir and has a self-contained web.config). In case it's relevant, this is a sort of research site made up of 40 or 50 unconnected microsites. Each microsite is typically a simple form allowing a user to submit a form, which then runs a Stored Proc on a sqlserver db and displays a chart and/or table of the results. There is very little security to worry about. The database connection info is in a central file (in the case of the classic asp) or app's individual web.config (lots of duplication there) To add a little spice to the exercise... I have no idea how to admin IIS The company no longer employs the sysadmin or the guys who set this thing up. (They're not going to employ me much longer either but my sense of professional pride does not permit me to just walk away from this task). The servers are on mutually firewalled networks and I have to perform a convoluted, multi-step process to copy anything from one to the other. Would someone please point me to a crash-course tutorial for accomplishing the above? I have: a complete copy of the site's filesystem on the new box installed the 3rd party charting tool on the new system a config.xml file from the "all tasks - save configuration to a file" right click menu. There doesn't seem to be a way to import it on the new system however. The newer IIS manager has a completely different UI and I'm totally lost. Please help.

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• Old scheduled task still being started, but can't find it.

  - by JvO

  System: Windows XP Home Summary: Some scheduled task is still being started by Windows, but I can't find it, nor determine where its configuration has been stored. This is turning into a mystery for me... I set up a Windows XP Home machine to run a task at 7:00 AM, using the Task manager. This was a clean install, no users defined, so you got straight to the desktop after starting the machine. The filesystem uses NTFS. Later on, I needed to introduce users, so I created one (named Sam) with administrator privileges. After this I noticed that the scheduled task failed, most likely due to privilege errors (i.e. can't write to a network drive). So I want to delete the old task, and add it again with the correct user credentials. However.... I can't find the old task!! I know it is still being executed at 7:00 AM, but there's no mention anywhere on the system of this task. I've looked in c:\windows\tasks for .job files, but there's only the "MP Scheduled Scan.job" from Security Essentials. I've searched the whole disk for mention of the batch file that is being run, but can't find it. So why is this old task still running, and more importantly, why can't I find it? Would it have something to do with introducing users on XP?

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• Exchange 2010 - Certificate error on internal Outlook 2013 connections

  - by Lorenz Meyer

  I have an Exchange 2010 and Outlook 2003. The exchange server has a wildcard SSL certificate installed *.domain.com, (for use with autodiscover.domain.com and mail.domain.com). The local fqdn of the Exchange server is exch.domain.local. With this configuration there is no problem. Now I started upgrading all Outlook 2003 to Outlook 2013, and I start to get consistently a certificate error in Outlook : The Name on the security certificate is invalid or does not match the name of the site I understand why I get that error: Outlook 2013 is connecting to exch.domain.local while the certificate is for *.domain.com. I was ready to buy a SAN (Subject Alternate Names) Certificate, that contains the three domains exch.domain.local, mail.domain.com, autodiscover.domain.com. But there is a hindrance: the certificate provider (in my case Godaddy) requires that the domain is validated as being our property. Now it is not possible for an internal domain that is not accessible from the internet. So this turns out not to be an option. Create self-signed SAN certificate with an Enterprise CA is an other option that is barely viable: There would be certificate error with every access to webmail, and I had to install the certificate on all Outlook clients. What is a recommended viable solution ? Is it possible to disable certificate checking in Outlook ? Or how could I change the Exchange server configuration so that the public domain name is used for all connections ? Or is there another solution I'm not thinking of ? Any advice is welcome.

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• Random server lag, no CPU/mem/pagefile usage

  - by Kev

  We have a fairly new server running Windows 2003 SP2, and the past few days we've noticed random slowdowns. When I'm logged into the server over remote desktop while this is happening, or if I'm physically sitting at the server logged in, suddenly everything becomes extremely laggy. Any UI element I try to interact with takes upwards of ten seconds to react, and then responds very slowly. Then a minute later everything is quite snappy again. During this, I have Task Manager minimized to the tray, and there's no CPU usage. I open it up right after this happens, and there's very little CPU usage on the graph, and no memory or pagefile usage above normal. (Normal being 1.5 GB free in the case of memory.) This is what I see logged into the server, and then users start calling saying things are slow, timing out, and failing--anything to do with our server. No events in the Event Viewer around the times this happens. The context I'm working in (last thing I clicked, etc.) seems different every time--different programs active, different combinations of programs open. Never anything particularly stressful (like adding an event entry to a Cobian Backup configuration, or editing text in TextPad, which has been exceptionally stable in my extensive usage of it.) I would've thought it was just the server, but a family member's home PC (entirely separate) running WinXPSP3 had the same thing happen to it last night a few times. Is this some new behaviour introduced by the latest Windows Updates? Either way, where do I even start to look when nothing seems to be chewing up resources?

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• High availability virtual machines

  - by Jeremy

  I've been reading a lot about high availability virtualization, either via Hyper-V or VMWare. In that context, essentially high availabliity means that the VM is hosted by a closter of physical servers (nodes), so if one of the physical servers goes down, the VM can still be served by other physical servers. So far so good, the physical cluster and the VM itself are highly available. However if the service being provided, let's say SQL server, MSDTC, or any other service, are actually being provided by the VM image and the virtualized operating system. So I imagine that there is still a point of failure at the virtual layer that isn't accounted for. Something could happen within the virtual machine itself that the physican cluster can not account for, correct? In that instance the physican failover cluster (Hyper-V) or VMWare host, can not fail over, because the issue is not with one of the servers in the physical cluster - failing over a physical node would not do any good. Does this necessitate building a virtual failover cluster on top of the physical one, or is this not necessary? Alternatively, I suppose you could skip the phsyical clustering, and just cluster at the virtual layer (Child based failover clustering), because that should still survive a physical failure. See image below showing parent based (left), child based (right) and a combination (center). Is parent based as far as you need to go, or is child based more appropriate?

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• Multiple logins with pam_mount means multiple (redundant) mounts ...

  - by Jamie

  I've configured pam_mount.so to automagically mount a cifs share when users login; the problem is if a user logs into multiple times simultaneously, the mount command is repeated multiple times. This so far isn't a problem but it's messy when you look at the output of a mount command. # mount /dev/sda1 on / type ext4 (rw,errors=remount-ro) proc on /proc type proc (rw,noexec,nosuid,nodev) none on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) none on /dev type devtmpfs (rw,mode=0755) none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) none on /dev/shm type tmpfs (rw,nosuid,nodev) none on /var/run type tmpfs (rw,nosuid,mode=0755) none on /var/lock type tmpfs (rw,noexec,nosuid,nodev) none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) //srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand) //srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand) //srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand) I'm assuming I need to fiddle with either the pam.d/common-auth file or pam_mount.conf.xml to accomplish this. How can I instruct pam_mount.so to avoid duplicate mountings?

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• choosing hosting for custom ecommerce site, shared, dedicated, what to look for?

  - by spirytus

  Hi, I have (almost) developed website for my client and now need to decide on hosting. Most of the users of the site will be located in Australia, and so am I and my client. Now, I want to consider everything before deciding on host and few questions comes to my mind: I cannot afford website being down, and all hosts say something like "99% uptime guranted". Should just that be enough or shall I ask hosts for some stats maybe? Does it make any difference if servers and whole hosting company is located in Australia or outside? I've been hosting few sites with JustHost.com on shared hosting (cheapest plan, servers in US I believe) and never seen any delays but could that be an issue? I would prefer Australian company so I can actually go to them and give them piece of my mind if something goes wrong, but US servers seem cheaper. Would share hosting do? Its ecommerce custom build php application, I know there are security issues with sessions etc on shared hosting. Will take precautions of course but could share hosting be an issue? Would dedicated be worthy option considering that my knowledge of server is very limited? I need to run php/mysql, with preferably unlimited bandwidth as with my experience I cannot tell what amount of traffic would be sufficient. Please let me know if I didn't provide you with enough information so you could answer my questions, will gladly explain further. In advance thanks for any answers :)

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• iptables, blocking large numbers of IP Addresses

  - by Twirrim

  I'm looking to block IP addresses in a relatively automated fashion if they look to be 'screen scraping' content from websites that we host. In the past this was achieved by some ingenious perl scripts and OpenBSD's pf. pf is great in that you can provide it nice tables of IP addresses and it will efficiently handle blocking based on them. However for various reasons (before my time) they made the decision to switch to CentOS. iptables doesn't natively provide the ability to block large numbers of addresses (I'm told it wasn't unusual to be blocking 5000+), and I'm a bit cautious over adding that many rules into an iptable. ipt_recent would be awesome for doing this, plus it provides a lot of flexibility for just severely slowing down access, but there is a bug in the CentOS kernel that is stopping me from using it (reported, but awaiting fix). Using ipset would entail compiling a more up-to-date version of iptables than comes with CentOS which whilst I'm perfectly capable of doing it, I'd rather not do from a patching, security and consistency perspective. Other than those two it looks like nfblock is a reasonable alternative. Is anyone aware of other ways of achieving this? Are my concerns about several thousand IP addresses in iptables as individual rules unfounded?

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• Centos 6.2 postfix install dependency issues

  - by Mishari

  I am administrating a VPS running cPanel and I'm trying to install postfix. Redhat-release says the version is CentOS release 6.2 (Final) and uname -a says: Linux server.mydomain.com 2.6.32-220.el6.i686 #1 SMP Tue Dec 6 16:15:40 GMT 2011 i686 i686 i386 GNU/Linux This is how I'm installing postfix (I had tried to solve the problem earlier by installing epel). # yum install postfix Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile * epel: mirror.cogentco.com Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package postfix.i686 2:2.6.6-2.2.el6_1 will be installed --> Processing Dependency: mysql-libs for package: 2:postfix-2.6.6-2.2.el6_1.i686 --> Finished Dependency Resolution Error: Package: 2:postfix-2.6.6-2.2.el6_1.i686 (centos-burstnet) Requires: mysql-libs You could try using --skip-broken to work around the problem Attempts to install mysql-libs tells me several files conflict with "MySQL-server-5.1.61-0.glibc23.i386" I'm not sure why or how this is happening, does anyone know how to resolve this? Surely Centos 6.2 could not have shipped with a broken postfix.

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• Is there a clean way to obtain exclusive access to a physical partition under Windows?

  - by zneak

  Hey guys, I'm trying, under Windows 7, to run a virtual machine with VMWare Player from an OS installed on a physical partition. However, when I boot the virtual machine, VMWare Player says that it couldn't access the physical drive for writing. This seems to be a generally acknowledged problem in the VMWare community, as Windows Vista introduced a compelling new security feature that makes it impossible to write to a raw drive without obtaining exclusive access to it first. I have googled the issue and found a few workarounds. However, the clean ones seem to only work on whole physical disks, and not on partitions. So I would be left with the dirty solution. In short, it meddles with the MBR to erase any trace of the partitions to use, makes Windows forget about them, then restores the MBR so we can launch the VM. I'm not sure I want to do that. Is there a way to let VMWare acquire exclusive access to the partition without requiring me to nuke it away? What I'd be looking for, I suppose, is a way to put just partitions offline instead of whole physical drives.

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