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• Is it necessary to have firewalls rules between trusted nodes communicating on their backend interfaces?

  - by Tom

  I have 6 nodes that have internet access on eth1 and private access to one another on eth0. Currently I have firewall rules for eth0, for things like memcached and NFS. Is this necessary? It's a real headache as NFS for example communicates on loads of different ports, and I recently introduced glusterfs which needs more still. Is the headache of figuring out what backend ports to unblock worth the security enhancement? I should mention that I will of course still have a firewall rule on eth0 to block servers owned by others in the same datacenter. Thanks

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• Can't downgrade or update jailbroken iPhone

  - by showline2

  I can't update or downgrade my iPhone 3GS, Firmware 4.3.5 tethered with redsn0w. Whenever I try to update it, I get a "device isn't eligible" error. I researched on how to do that, like changing host files, but none of them worked for me. I use OS X Snow Leopard. ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost 74.208.10.249 gs.apple.com This is my host file – not sure if it's the orginal one or not.

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• Sudden slow read & write speed on all IO

  - by user23392

  I have a custom built rig that has 2 storage drives. for OS: Western Digital 1.0TB HARD DR 64MB for other stuff: Corsair Performance 3 128GB (SSD) [ expected read speed: 400 mb/s ] The system was incredibly fast for a couple of months, then one day i was playing a game then it started to get buggy (some sounds and objects disappearing), i stopped the game and the system seemed to be unstable so i had to shut it down, next morning i couldn't start it up, it was saying something about corrupt device. I formatted both disks and installed a fresh copy of windows, all i can say that since that day the system was never like before, it takes 10 minutes to boot up (the icons and desktop slowly appear). but once it's done the slowness isn't as noticeable. Here's my benchmark on the HDD ( read speed - write speed ): And the SSD: Anyone knows what could be the issue?

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• Problem with Windows Boot Manager after using GParted

  - by Cenoc

  I Get the follow: Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: Insert your windows installation disc and restart your computer. Choose your language settings, and then click "Next." Click "Repair your computer." If you do not have this disc, Contact your system administrator or computer manufacturer for assistance. Status: 0XC0000225 Info: The boot selection failed because a required device is inaccessible. After I tried to expand the Windows partition. I dont know where I put the Windows 7 CD and I was wondering if anyone knew of any way of fixing this problem? I'm guessing I deleted something I shouldnt have deleted....... I actually wanted to get some more space at the expense of the recovery drive. Thanks in advance!

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• How to switch easily between a 5.1 headset and 2.1 speakers ?

  - by Wookai

  I have a 5.1 headset that I mostly use for gaming and watching movies. It is connected using 3 jacks to the rear panel of my motherboard (plus one for the microphone). I also have some small 2.1 speakers that I sometimes use to listen to music or to share a video/movie with someone. For now, what I do is crawl under my desk, and switch the cables. As my motherboard has 7.1 capabilities, I am wondering if there could be a way of having all 4 jack cables always plugged in, and switching on which device to output the sound programmatically. Has anybody had a similar problem, and how did you solve it ?

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• Need Assistance on ASUS K55V USB ports not working

  - by Pascal Schilling

  I have a K55V ASUS laptop, W7 Home (64bit). Whenever I try to use a mouse (or any other USB device), it doesn't work because of a driver problem. The automatic update tries to update the driver and requires me to reboot directly after. It doesn't work. Windows update then wants to re-attempt the update and then I have to reboot (etc). Now, after 10 tries it still doesn't work. Can some one help me out on this? No USB ports work at the moment, it has 2 USB 3.0 ports and 1 USB 2.0 port.

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• Process vsserv.exe attempts connection to unknown host (clients.your-server.de)

  - by pushpraj

  from past few day I notice a new connection is being made from my system, I discovered it within the outpost firewall, it is blocked by default with the reason Block Transit Packets in the image above you can see that the process vsserv.exe is attempting a connection to static.88-198-155-41.clients.your-server.de I tried to search on google but could not find any relevant info, however this link http://www.webmasterworld.com/search_engine_spiders/3963600.htm says that your-server.de hosts bad bots. I am bit concerned if something is not correct. Could you help me understand the same?

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• MacBook repeatedly disconnects from WiFi

  - by redwall_hp

  I have an early 2008-model MacBook (2.4GHz). The WiFi router I have at home is a Linksys WRT54GX2 that I have had for a few years. My MacBook has recently started disconnecting from the router every few minutes, which is rather annoying. I can reconnect again without having to restart the router or anything, as it seems that the MacBook is just dropping the connection. I have tried changing the channel on the router, and upgrading the laptop from Leopard to Snow Leopard made no difference either. I'm only about six feet from the linksys device, so distance isn't an issue. This only happens with the Linksys router, while I can use the local library's open network without issue. The problem also seemingly becomes more pronounced after midnight. Any ideas as to what the problem could be?

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• What is the "real" difference between a NAS and NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over standard ethernet, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over NFS on servers?

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• Blocking facebook's Like button in firefox

  - by Quiark

  Many sites today use widgets from facebook such as the Like button, list of friends who are fans of that site and so on. While it may be a nice feature, I perceive it to be a serious privacy intrusion, because facebook most likely stores information about which sites you visit. I also heard that when you are not logged into facebook, it still tracks the sites you visit (probably with a cookie) and once you log in attaches the data to your real account. For now, I want to keep using facebook, but I would like to block just these widgets so it can't track me. Is there any Firefox extension which could do that?

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• Binding services to localhost and using SSH tunnels - can requests be forged?

  - by Martin

  Given a typical webserver, with Apache2, common PHP scripts and a DNS server, would it be sufficient from a security perspective to bind administration interfaces like phpmyadmin to localhost and access it via SSH tunnels? Or could somebody, who knew eg. that phpmyadmin (or any other commonly availible script) is listening at a certain port on localhost easily forge requests that would be executed if no other authentication was present? In other words: could somebody from somewhere in the internet easily forge a request, so that the webserver would accept it, thinking it originated from 127.0.0.1 if the server is listening on 127.0.0.1 only? If there were a risk, could it be somehow dealt with on a lower level than the application, eg. by using iptables? The idea being, that if someone found a weakness in a php script or apache, the network would still block this request because it did not arrive via a SSH-tunnel?

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• Prevent URLs from specific domains from being saved in Firefox history

  - by noam

  I want to prevent or block URLs of specific domains from being saved or shown in my history. I want to be able to go to these certain websites normally, just not have them saved and not have to use private or incognito mode. For instance, I don't want any of Google's search result pages to be saved in my history since then when I use the awesomebar I get a lot of Google's search results, which are of no use to me. Of course I can keep on deleting them, but I would like a way to specify that any URL starting with www.google.com shouldn't be saved.

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• Easiest way to move my Windows installation to an SSD?

  - by Jon Artus

  I've taken the plunge and bought an SSD and want to move my existing Windows installation over. The current hard disk is 500Gb, but I've trimmed the contents down to about ~40Gb. I'm transferring it across to a 100Gb SSD and looking for the easiest way just to copy everything across and set the SSD up as a boot device. I've looked at a few tools like Macrium Reflect, but they don't seem able to restore to a smaller drive. Do I need to go for something like PING to do this? I'm trying to avoid scary Linux-based boot utilities if possible, does anyone know of an easier way?

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• Volume expanded in Volume Group, old disk reduced but still in use in system

  - by Yurij73

  Tryed to add a new hard sdb (not formated) to my virtualbox Centos. Successfully extended an existing vg_localhost to /dev/sdb/ # lvdisplay --- Logical volume --- LV Path /dev/vg_localhost/lv_root LV Name lv_root VG Name vg_localhost LV UUID DkYX7D-DMud-vLaI-tfnz-xIJJ-VzHz-bRp3tO LV Write Access read/write LV Creation host, time localhost.centos, 2012-12-17 LV Status available # open 1 LV Size 18,03 GiB Current LE 4615 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdb 8:16 0 20G 0 disk +-vg_localhost-lv_root (dm-0) 253:0 0 18G 0 lvm / +-vg_localhost-lv_swap (dm-1) 253:1 0 2G 0 lvm [SWAP] sda 8:0 0 9G 0 disk +-sda1 8:1 0 500M 0 part /boot +-sda2 8:2 0 8,5G 0 part sr0 11:0 1 1024M 0 rom df -h /dev/mapper/vg_localhost-lv_root 6,5G 6,2G 256M 97% / tmpfs 499M 200K 499M 1% /dev/shm /dev/sda1 485M 78M 382M 17% /boot it still old sda in use, what i have to do further?

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• Can I backup my IMAP Gmail account locally using only Alpine?

  - by BasicObject

  I recently discovered cli email clients and have fallen in love with their speed and simplicity. After playing around with mutt and alpine I decided I favor alpine. I am a Gmail IMAP user and have many years of emails that I'd like to store locally. Is there a more or less convenient way to retain IMAP functionality and backup only the emails that haven't been backed up already on a weekly basis? I have alpine setup with my Gmail with IMAP and it's working great. I'm just wondering if there is a way to make an offline backup or "archive" locally on my computer while retaining the multi device access that IMAP offers. I apologize if this has been asked before, I did search for it and did not find my answer. Thank you for reading.

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• Distributed website server redundancy

  - by Keith Lion

  Assume a website infrastructure is very complicated and is fully distributed (probably like most large web companies). Am I right in thinking that although there are all these extra web servers to handle multiple client requests, there is still a single "machine" whereby users must enter? I am guessing this machine will be the one physically associated to the IP address? I ask because I need to know whether, in places where distributed systems exist, there is still a single point of failure- usually the control node or, in this example, the machine connected to the public internet? Surely there cannot be two machines connected to the internet, as they would have to have different IP addresses? This "machine" may not be a server per se, but maybe it is a piece of cisco equipment. I just need to know whether, in the real world, these distributed systems still have a particular section where they depend on the integrity of one electronic device?

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• Xen VGA passthrough: is it possible to have dual GPU's with single monitor

  - by user489481

  I hate dual-booting between Windows when I want to play a game and Linux when I need to work. I don't fancy running Linux in a VM and Wine almost never works for me. So, I'm thinking about buying a new mainboard and CPU that is compatible with Xen's VGA passthrough and HVM virtualization. I want to be able to switch between the Linux Dom0 and Windows DomU with ease, but the problem is I need two GPU's and have only one monitor. Right now I have a nVidia GTX 260 in my PC, but I also have a Radeon 4850 sitting in my closet that I was going to sell. My question is, can I salvage the Radeon card to run the Dom0 and have the nVidia card run the DomU while having some kind of device/software to connect them a single monitor? Power supply and airflow issues aside. If not, what would you suggest? Is this even possible?

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• Newly installed DIR-615 - how to connect to the wireless?

  - by JK123

  I've just installed a D-Link DIR 615, but can't figure out how to connect to the wireless.. When I double click my wireless icon in the tray, it does show the new network. Its starts the "WiFi protected setup wizard" and the first thing it asks for is the "Device Ownership Password". I have no idea what that is - I've tried the PIN and the router password. On the next page it says: SSID: _(name)__ Security type: _wpa2 personal aes ccmp_ Password: _some long key that is not what I entered during router setup_ I change the key to the one I created when setting up the router. I've also tried leaving the key as it is shown in the dialog. But it does not connect either way. All it says is "Configuration failed" So how do I connect to the new wireless network??

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• NFS of NAS server blocks in cluster environment

  - by Zardoz

  In our department we have an Iomega NAS (px4-300d) connected to a Supermicro cluster with 5 nodes (12 cores per node). Each node mounts a share on that NAS by using NFS. Unfortunately after some time (several minutes) of permanent read/write operations (from all nodes) the NAS starts to block and a bit later freezes completely. We tried several options of the mount command, but nothing helped (async, intr, wsize, rsize). The NAS itself doesn't allow many options (better to say none). Do you have any recommendation how to integrate a NAS using NFS in a cluster environment?

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• nginx: URL rewrites and performance

  - by j0nes

  I have a website where I need to change the URL structure. The old URLs look like /olddir/part1_de.htm, the new ones will look like /newdir/sub/category/anotherpage.htm. There are a lot of URL rewrites I need to do, I assume about 500 distinct rewrites in the end. As my website gets quite a lot of traffic, my main concern is about performance at the moment. My questions are: I assume that for each request, the rewrites block will be parsed and the regex will be evaluated. Am I right? Will there be a performance penalty if I use these rewrites? Can nginx handle this? Are there any "best practices" to follow when doing a lot of rewrites?

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• What does SQL Server do if you select more than 1 full backup when doing a restore?

  - by Rob Sobers

  I have a backup file that contains 2 backup sets. Both backup sets are full backups. When I open SQL Server Management Studio and choose "Restore..." and pick the file as my device, it lets me pick both backup sets. The restore operation completes without error, but I'm not sure exactly what SQL server did. Did it restore the first one, drop the database, and then restore the second one? Will it always let the most recent full backup prevail? It doesn't seem to make sense for SQL server to even allow you to select more than one full backup.

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• Cannot connect to HTTPS port on Ubuntu

  - by Simpleton

  I've installed a new SSL certificate and set up Nginx to use it. But requests time out when trying to hit HTTPS on the site. When I telnet to my domain on port 80 it connects, but times out on port 443. I'm not sure if there's some defaults on Ubuntu preventing a connection. UFW status shows: 443 ALLOW Anywhere netstat -a shows: tcp 0 0 *:https *:* LISTEN nmap localhost shows: 443/tcp open https The relevant block in the Nginx config is: server { listen 443; listen [::]:80 ipv6only=on; listen 80; root /path/to/app; server_name mydomain.com ssl on; ssl_certificate /etc/nginx/ssl/ssl-bundle.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { proxy_pass http://mydomain.com; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } }

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• Slow performance with WAMP localhost access from other devices

  - by Adam

  I setup a localhost WAMP server and other device can access my localhost site on my win8 laptop with computer name instead of IP (bc I have use DCIP so that the wireless router can assign me IP otherwise it will not work). However, problem is that the website (WordPress), access speed is extremely slow on other devices other than my localhost computer, usually a 3s task take at least 10 seconds. (i.e. view my localhost site with computer name in a phone within the same wireless network.) Is that normal? What could be the reason causing it? Thank You

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• Backup solution

  - by user66115

  We are currently looking for a new backup solution. Our current network is 5 remote location with a tape backup in each plant. Right now we are looking at a MPLS VPN and running backups out of our main plant. The main thing that we backup are user private folders and department files. And each plant has it's own file server that houses CAD drawings. My main plan is to have every thing but that CAD drawing at the main faculty. We would start with a main backup of the drawing files and then do change backups back to the main plant. Besides tapes what would be the best way to backup. Our contact at Pc Connection is point us toward a Tandberg Data device.

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