Recent Questions

My Postfix server was working fine until last days but now, I can't receive emails from outside (I mean with an email of different domain name like gmail for example). I must make notice that I can send email from the server to gmail. From what I have seen, I think that issue may be my iptables rules : # iptables -L Chain INPUT (policy DROP) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ACCEPT all -- ...

I am running Ubuntu 16.04 LTS and am using Vagrant to run a Ubuntu 14.04 Server with a LAMP stack setup. I am working on a Laravel 5.2 project, but constantly have issues with the permissions in the storage folder/sub-folders. Currently, the folders are owned by my user/group. Anytime some file needs to be created or written too, I get a permission denied error. I can fix this with by chmoding the files to 777. This however does't fix the issue of having the problem when a new file is made (for ...

I have a home network built around an ancient computer that I've tued into a router, running Debian Wheezy. The wireless part is based on a TP-LINK TL-WN851ND PCI card on the hardware side, and uses hostapd on the software side. Now, I have recently obtained a new phone, on which I am running CyanogenMod 12.1 (equivalent to Android 5.1). This device can connect to my wireless network, but most network operations (e.g. downloading things) result in timeouts, requiring retries. Fetching emails ove...

I am trying to setup an OpenVPN server on my desktop that I will connect to on my laptop (both running windows 8.1 64-bit, with the 64-bit versions of OpenVPN installed). The setup procedure calls for the easy-rsa package, which is no longer included with OpenVPN, but is available separately. I have installed easy-rsa version 3.0.1. The first step in the setup is to run "init-config" in command prompt in the directory "C:Program FilesOpenVPNeasy-rsa", but it fails, giving me the typical "not rec...

When iPhone is plugged in computer running Windows 10 it starts installing drivers. Windows doesn't show UAC screen, or user permission to install drivers. Sure, it is convenient, but what is the security model here? Does it mean that any usb stick can silently gain permission for arbitrary code execution? Or this usb stick would needs a signed certificate to do so? Let's block ads! بخوانید...

You don't need to reserve any space, but the less space you use the longer the SSD will last - the logic for spreading out writes is spread evenly over the disk by the drive (ie wear leveling is not an OS or file system level thing). Further, you should not need to worry too much about wear on a decent quality SSD on typical workstation loads - the number of read-write cycles is quite high. Its generally a good idea to at least 10% and preferably 20% of a partition free from a point of view of s...

Issue I'm following this great how-to and all goes well until packer needs to shutdown the newly provisioned which fails with Cannot unregister the machine 'packer-virtualbox-iso-1469510168' while it is locked. See full log below at the end of this question. I've done the following Check no stale VirtualBox VMs are left around with that name (all clear) Update VirtualBox to latest available (5.1.2 r108956) Reboot my host computer but this consistently happens. Environment Host OS - OS X El Capit...

Would choosing between SHA-512, RIPEMD-160, or Whirlpool have any impact on the actual performance of a truecrypt partition once it's mounted or not? Thank you ...

To make this simple: When I try to play Overwatch (or any game, using Overwatch as the example) on my Lenovo Y570 on its own LCD, it averages about 30 FPS, with the sound quality going down with it, until the sound is audibly slideshow-ing. However, when I hook up a Lenovo P2770HD laptop and output my video there, I easily hover around 60 FPS. What interests me most is that the resolution increases, so that's not an issue (1366x768 -> 1920x1080). Completely dumbfounded as to what could possib...

In an indoor environment, I have more than 10 clients are connecting to an AP, pinging 50000 byte of packet size. Then I add another 10 clients, pinging 50000 byte of packet size. After running few hours, start to see 3-4 devices encountered tx-ccq low % (eg. 1 - 5%). I tested the AP with LANforge tool, it can support up to 50-60 concurrent users. However, this is not tally with what I tested in real environment. Not sure what is the root cause of this dropped tx-ccq issue. Any idea to improve t...

I have postgres 9.3 on win7. I have fixed ability to login (md5 fix in configuration) and now I would like to tweak the performance. Give the service more resources (more RAM). How do I do that? (either editing config and restarting or I also have pgAdmin III installed). Let's block ads! بخوانید...

I have 16G ram and 2T hard drive, then added 120G Samsung SSD as new boot C: (had shop do it) and 2 things happened. The performance was much better for Win boot, but sometimes on opening a drive or a directory that green bar that paints on top of the box would take a minute maybe even 4 mins to slowly paint. Other times no issue at all, fast. At the same time Search all of a sudden would miss both files and directories that were actually there. Think the 2 are related.Image Of Slow Green Bar An...

Is there a relation between a data compression format (zip, gzip, bzip2, etc.) and it's ability to ease in recovering broken data? I want to store some backups (like tar.gzs) but then I started wondering what could happen if the archive somehow becomes corrupt, like when changing a single bit randomly. Will the entire file become useless or are there mechanisms to minimize damage? Most information I find is purely about storage efficiency and they never seem to mention possible corruptions... Le...

Not a single advice i have came across helped me so far, you are my only hope guys. I registered a free certificate from startssl, and tried to install it on my postfix server. OpenSSL confirms that my private key matches the certificate, unencrypted key is chowned by Postfix user, and all other files are loading pretty well. However, whenever I either send mail, receive mail, or connect through telnet i get message in logs saying cannot get RSA private key from file /etc/postfi/ssl/mydomain.ke...

I am running two HD 7970s in crossfire on my windows 10 rig. Through afterbuer I can see that both cards are working in tandem when bench marking and in most games. However, I have noticed in a few games, Skyrim mainly, that only the master is utilized when playing. The slave card usage does jump up a little bit when first loading different areas, however, it quickly drops back to zero and stays there. Are there some games that just can't use crossfire? Is there some setting I am unaware of? Le...

Have a mostly Ruckus AP wifi environment outside the US. Having issues with our Motorola ET1 staying connected after going to sleep, (we have similar setup in other Ruckus environments with no issues). Comparing this environment with a similar Ruckus setup without the wifi drop issues, a network engineer suggested that maybe enabling 802.11d on the switches could help. Could having a US device with 802.11d enabled, on a network with 802.11d disabled cause connectivity issues? If so, could you ex...

I am running Windows 8.1 in a KVM virtual machine with ok-ish performance. Problem is, the "display" of the VM (Spice) is very laggy. Is there a prefered way to display the screen of a Windows VM running in KVM that has better performance compared to Spice? Let's block ads! بخوانید...

I've been reading about hard disk drives performance and I've noticed that a lot of users agree that from the day-to-day point of view there isn't a huge difference in using SATA 3G or Sata 6G as long as you're using a regular spinning-mechanism HDD (link to forum). Yet most of them agreed that a mayor performance difference was noticed between 5400 and 7200 rpm HDDs (asume same cache size and SATA interface). I know that SSD drives don't have a spinning mechanism so there's no such thing as an ...

Yesterday i encountered INACCESSIBLE_BOOT_DEVICE blue screen error So i performed a clean install(Formated c drive and reinstalled os) then today When i start my pc it shows Recovery error Try again shows same error f8 does do anything screen blinks and same screen come back So i created Windows Bootable Media to repair or Reinstall windows But after loading files screen goes black and nothing shows up... Same for booting in safe mode , low resolution mode. How can i fix this? Let's block ads!...

First diagnostics showed the following error: windows socket registry entries missing Then I have removed the registry entries and reinstalled them by downloading and ran the following command: netsh winsock reset Now, the diagnostics shows different error: The device or resource (oucgwsmb.emea.nsn-net.net) is not set up to accept connections on port "The File and printer sharing (SMB)". The samba logs shows this: [2016/06/20 11:30:22.551172, 2]smbd/sesssetup.c:1413(setup_new_vc_session)...