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• Why is Google Home page changing spontaneously

  - by Bob

  Periodically, my Google Chrome home page (which I have originally set myself) changes spontaneously on opening the browser to display, instead, the page showing the rectangular small images of webpages I have visited before. In addition the bookmarks bar and my homepage icon has disappeared. I am also not directed to any other website location as might occur if a virus or malware were involved. I can correct all of these changes back to my original settings the way I prefer (and nothing prevents my resetting it) and can continue to browse with no difficulty but this changed situation has happened several times in the past month. I had assumed that this was an idiosyncrasy of how Chrome (mis)behaves but worry whether virus or malware might be involved. I have monitoring by antiviral and antimalware software and run periodic complete scans and occasionally these find Trojans and other malware which are removed but this browser behavior seems to recur I would like to prevent the surprises Thank you.

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• Munin fills server memory

  - by danilo

  In the last weeks, it happened several times to me that my vserver (Debian Lenny) was out of RAM (500M) and therefore wasn't able to run apache anymore. When looking at the processes with top, I saw that there were many open munin-limits and munin-cron processes that consumed most of the memory. My guess would be that sometimes Apache temporarily needs more memory, which prevents munin-cron from running. And if munin-cron isn't able to stop itself, it would fill the memory until nothing is left. I don't know whether this guess is true, but could maybe someone know what the problem is and how to prevent it? If necessary I'll remove munin, but I'd prefer to keep it running.

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• Blue screen - BCCode: 7F

  - by Joe

  I've recently bought a refurbished Toshiba Satellite A660 11M and I get the blue screen of death appearing fairly frequently now, and I can't seem to work out why or how to prevent/cure it. Firstly I thought it was due to Zone Alarm from what I read on the net, but then I thought it was a memory issue after it crashed whilst I was running Memtest. But after I ran Memtest a second time, it completed without any errors... Here are my computer specs - Toshiba Satellite A660 11M 500 GB hard disk 4 GB RAM Windows 7 Premium Nvidia GeForce GT 330M and here is more info regarding the crashes I keep getting - Problem signature: Problem Event Name: BlueScreen OS Version: 6.1.7600.2.0.0.768.3 Locale ID: 2057 Additional information about the problem: BCCode: 7f BCP1: 0000000000000008 BCP2: 0000000080050033 BCP3: 00000000000006F8 BCP4: FFFFF80003040EC0 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1

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• CentOS Default ACLs on Existing File System Objects

  - by macinjosh

  Is there a way to have existing file system objects inherit newly set default ACL settings of their parent directories? The reason I need to do this is that I have an user who connect via SFTP to my server. They are able to change directories in their FTP client and see the root folder and the rest of the server. They don't have permissions to change or edit anything but their own user directory but I would like to prevent them from even view the contents of other directories. Is there a better way to do this than ACLs? If ACLs are the way to go I'm assuming a default ACL on the root directory would be the best way to do restrict access. I could then selectively give the user permission to view certain directories. The problem is default ACLs are only inherited by new file system objects and not existing ones.

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• SMTP hacked by spammer using base64 encoding to authenticate

  - by Throlkim

  Over the past day we've detected someone from China using our server to send spam email. It's very likely that he's using a weak username/password to access our SMTP server, but the problem is that he appears to be using base64 encoding to prevent us from finding out which account he's using. Here's an example from the maillog: May 5 05:52:15 195396-app3 smtp_auth: SMTP connect from (null)@193.14.55.59.broad.gz.jx.dynamic.163data.com.cn [59.55.14.193] May 5 05:52:15 195396-app3 smtp_auth: smtp_auth: SMTP user info : logged in from (null)@193.14.55.59.broad.gz.jx.dynamic.163data.com.cn [59.55.14.193] Is there any way to detect which account it is that he's using?

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• sasl and tls with dns load balancing

  - by achal tomar

  I am using DNS load balancing in my centOs 5 server.The mail sent to the load balancer server are balanced by sending them to 4 more servers who then pass the mails to their destinations in the network.The mails are generated by a Php script which gives all the mail to the load balancer server. Now i want sasl and tls authentication in the load balancer server so that i can prevent the mail server from spammers,Can anyone tell me how to do this. The load balancer pass the mails to other servers based on equal mx record preference,so i want sasl authentication with Dns load balancing.

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• Deny users in a certain group access to dovecot

  - by celil

  I installed the dovecot-imapd package in Ubuntu, and my setup is as follows: $ sudo dovecot -n # 1.2.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-27-generic-pae i686 Ubuntu 10.04.1 LTS log_timestamp: %Y-%m-%d %H:%M:%S protocols: imaps login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login mail_privileged_group: mail mail_location: maildir:~/Maildir mbox_write_locks: fcntl dotlock auth default: passdb: driver: pam userdb: driver: passwd For security reasons I would like to deny all users that are in the admin group ability to do imap login via dovecot. This is done in order to prevent a brute force attacker from discovering the admin passwords, and obtaining administrator privileges on the system. How can this be achieved? Presumably, I will have to modify some settings in /etc/dovecot/dovecot.conf, but I am hesitant to change the default settings lest I create other security vulnerabilities.

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• Encrypt remote linux server

  - by Margaret Thorpe

  One of my customers has requested that their web server is encrypted to prevent offline attacks to highly sensitive data contained in a mysql database and also /var/log. I have full root access to the dedicated server at a popular host. I am considering 3 options - FDE - This would be ideal, but with only remote access (no console) I imagine this would be very complex. Xen - installing XEN and moving their server within a XEN virtual machine and encrypting the VM - which seems easier to do remotely. Parition - encrypt the non-static partitions where the sensitive data resides e.g. /var /home etc. What would be the simplist approach that satisfies the requirements?

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• Issues with DHCP over multiple subnets

  - by Dan Monego

  I have a cisco router configured to handle multiple subnets (10.1.10.n, 10.2.10.n, etc), and an ubuntu system serving DHCP to the computers served by the router. After a restart of the DHCP, the systems on the 10.1 subnet are fine, but neither the server or the computers configured on the other subnets can see the router at 10.2.10.1 (or 10.3.10.1, or 10.4.10.1). The router can see itself at 10.2.10.1, however. The change that caused this was restarting the server, so I'm approaching it assuming the configuration error is on that end. Is that the likely issue or is there a different problem that would prevent the machines on the 10.2.10 subnet from resolving DHCP?

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• Removing past searches from Google Chrome's omnibar

  - by Ram Rachum

  One time I searched for Orange Juice in Chrome's Omnibar. Now, every time I start typing Orange, I get the search suggestion: How do I get Chrome to stop offering me this search suggestion? If I need to edit some config file, I can do that. Please don't post answers if you haven't ensured they work first. (This is intended to prevent people from answering "Press Shift-Delete.") Clarification: I'd prefer a solution in which I can selectively delete entries, not just by time segment. I also prefer a solution that does not involve cancelling any Chrome functionality.

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• Easily tell if focused on VirtualBox window?

  - by Benjamin Oakes

  Is there a way to make it very obvious that my VirtualBox window isn't in focus? The problem I'm having is switching between workspaces on Ubuntu or OS X and then trying to type in my Windows virtual machine, only to find that it's not in focus. The Windows window looks like it's in focus (based on the title bar), but I'm actually typing in Firefox on the host machine, for example. It's even worse because the Windows text insertion cursor is blinking to show focus. Ideally, I'd like the VM's display to get unsaturated (e.g. a "partial" grayscale) when not in focus, just to prevent this keyboard-focus problem. Other options would be fine too, as long as I don't have to second guess where my focus is. I'm not using the seamless mode -- the display is all within a window.

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• Laptop freezes on Wireless Mouse Adapter attach/detach

  - by Sergiy Byelozyorov

  I am using Microsoft Wireless Notebook Optical Mouse 3000 with Toshiba Satellite Pro P300-1CG. Recently I have installed Windows 7 64-bit. Now once in a while when I plug-in or plug-out wireless mouse adapter, the computer freezes (image stays on the screen, but the computer is not responsive). I have noticed that it mostly happens after I recover my computer from sleep mode. To continue using laptop I have to shut it down by pressing and holding power button for 7 seconds and then booting it up again. What can be done to prevent this?

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• Adding FTP Users via Simple Control Panel

  - by Aristotle

  I just got setup with CentOS yesterday through GoDaddy, and today I'm trying to get into the server and start setting up some of my projects. I'm able to get in through PuTTY just fine, but I'm not able to connect through FTP with the same (root) account. I'm using Simple Control Panel, and have ensured that "Enable Server" is checked beneathSystem Configuration > FTP. Further, I've checked, and double checked that my root password is correct when providing the FTP details. Is there some other common setting I'm missing here that will prevent me from getting connected to the server to begin transfering files?

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• gcc sandboxing tool - AppArmor / CHROOT jail on Ubuntu 12.04

  - by StuR

  We have a Node application as the front end to a C++ sandboxing tool, which compiles code using gcc and outputs the result to the browser. e.g. exec("gcc -o /tmp/test /tmp/test.cpp", function (error, stdout, stderr) { if(!stderr) { execFile('/tmp/test', function(error, stdout, stderr) {}); } }); This works fine. However, as you can imagine this is a security nightmare if it were to be made public - so I was thinking of two options to protect my stack: 1) A CHROOT jail - but this in itself wouldn't be enough to prevent directory traversal / file access. 2) AppArmor ? So my question is really, how could I protect my stack from any nasties that could come from: A) Compiling unknown code using gcc B) Executing the compiled code

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• Unattended install of IIS 6 with PHP / FastCGI

  - by Ciaran

  I'm trying to figure out the best method of installing PHP on IIS 6 unattended. I've figured that to install IIS 6 unattended I need to use sysocmgr and modify a registry key before hand to point at the correct sources folder to prevent being asked for an installation disc. The bit I'm caught up on at the moment is the process of installing FastCGI. The info I've read about installing FastCGI so far is that the installer unpacks 3 files and "registers" them with IIS. Question is, does anyone know what happens with these three files so I can handle it without using the installer? Also, if anyone has experience with the steps I need to take following the FastCGI install, I'd appreciate help.

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• Why do all my sites randomly stop in iis?

  - by Jen

  I have a GoDaddy Account with a virtual hosting environment. For some reason every few weeks, all of our sites (both websites and FTP sites) are stopped. I restart them and they start normally, but I would like to prevent this from happening in the future. It is an iis thing. When you open up iis you can see that each of the sites has been stopped in iis. Also, I have tried looking at the event viewer and I don't see anything, but I am not sure what I am looking for.

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• How can I restore VM on a new Hyper-V server?

  - by jaloplo

  Hi all, I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and configured as new Hyper-V server. My VM was in a another disk to prevent this happening but I don't know how to add it as a new VM on new server. In addition, this VM has various snapshots so, how can I add this VM to my new Hyper-V server? UPDATE: I can't do Export/Import because my server crashed before I can't do it.

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• Change popup format for Kopete in Gnome (Ubuntu 10.04)

  - by HorusKol

  After trialling Empathy which was included with Gnome/Ubuntu 10.04 I decided to go back to Kopete since I was losing chat messages. However, for some reason, Kopete is now displaying all popups in a big, ugly window with four options (ok, cancel, view, ignore, or something like that) that actually all seem to do nothing. I tried looking for options in Kopete to change the popup style to the nicer Gnome style one which goes up in the top-right of my desktop, but it doesn't seem to be possible with this release. So I had to resort to removing all popup messages from Kopete to prevent my screen being taking over by a popup requiring action for every incoming chat message. Unfortunately, this now means that I do not get any notifications when people message me - and so I can go a couple of hours without realising that they did. Anyone know how to get the nice, unobtrusive popups working in this version?

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• My site was recently attacked. What do I do?

  - by ChrisH

  This is a first for me. One of the sites I run was recently attacked. Not at all an intelligent attack - pure brute force - hit every page and every non-page with every extension possible. Posted with garbage data to every form and tried to post to some random urls too. All tod, 16000 requests in one hour. What should I do to prevent/alert this kind of behavior? Is there a way to limit the request/hr for a given ip/client? Is there a place I should be reporting the user to? They appear to be from China and did leave what seems like a valid e-mail.

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• How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

  - by hobodave

  We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is that a large portion of these hosts will actually be VMs on a single bare-metal machine. In fact, the only physical machines will be DB01, DB02, the firewalls and the switches. All other machines will be virtualized on a single host. One concern that has been is that this approach is complicated (overcomplicated implied), and that the VLANs are only providing an illusion of security, because "VLAN hopping is easy". Is this a valid concern, given that multiple VLANs will be used for a single physical switch port due to virtualization? How would I setup my VLANs appropriately to prevent this risk? Also, I've heard that VMWare ESX has something called "virtual switches". Is this unique to the VMWare hypervisor? If not, is it available with KVM (my planned hypervisor of choice)?. How does that come into play?

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• How to proxy and encrypt all my internet traffic with Win7 and Win2008R2?

  - by Malartre

  Hi, I have a Windows 7 laptop and a Windows 2008 R2 server. How can I encrypt and route all my internet request from the Win7 laptop to the Win2008R2 server? I guess the server would be called a proxy? Goal is to prevent unencrypted network snooping. I found this article about using SSH, but I would prefer an official windows integrated solution. What's the Microsoft "way" on this? http://lifehacker.com/237227/geek-to-live--encrypt-your-web-browsing-session-with-an-ssh-socks-proxy I would like this to work for all internet traffic, not just browser traffic and I would like to set this up on many Win7 clients. Carl

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• network user isolation

  - by seaquest

  My question is for a network with a Linux iptables router gateway. How can it be possible to prevent inter-network traffic of those users. Think this case as a public network, IPs are distributed through linux gw and users are authenticated thru the gateway. We want to protect public users from public users. Network is not wireless and I can not use Wireless AP user isolation. Actually I have a simple method. Subnet the network into /30 mask. Give minimum IP of each subnet to the gateay and ditribute those /30 IPs from the subnet. But this is pretty costly for such an aim. I want to ask for other methods Thanks.

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• How do I automatically add icons to windows 7 task bar?

  - by Nick

  Hi, I use the Microsoft Deployment Toolkit to install images and applications using a Lite-touch installation method. I would like to automatically add the icons to the "superbar" after installation so the users will be more inclined to use the improved task bar, rather than continuing to use desktop icons. I understand that there is no programmatic access to the task bar to prevent applications from adding themselves to the task bar, filling it with unwanted applications. Is there a way to use MDT, or even GPO to add icons to the task bar, or shall I use a VBS to add the Start menu shortcuts to the task bar?

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• Disable static content caching in IIS 7

  - by Lee Richardson

  I'm a developer having what should be a relatively simple problem in IIS 7 on Windows Server 2008 R2. The problem is that IIS 7 is overzealously caching all static content on the server. It's caching all .html and .js content and not noticing when the content changes on disk unless I iisreset. I've tried the following: Deleting the local cache in my browser (I'm 99% positive this is a server caching issue) In IIS Admin in OutputCaching adding an .html extension and unchecking "User mode caching" and unchecking "Kernel-mode caching" In IIS Admin in OutputCaching adding an .html extension and checking "User mode caching" and selecting the radio for "Prevent all caching" In IIS Admin editing Output Cache Feature settings and unchecking "Enable cache" and "Enable kernel cache under OutputCaching. Running "C:\Windows\System32\inetsrv\config\appcmd set config "SharePoint - 80" -section: system.webServer/caching -enabled:false" Looking through applicationHost.config and disabling anything related to caching I could find. Nothing seems to work. I'm getting very frustrated. Can anyone please help?

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• Avoiding syslog-ng noise from cron jobs [closed]

  - by Eyal Rozenberg

  Possible Duplicate: How can I prevent cron from filling up my syslog? On my small Debian squeeze web server, I have syslog-ng installed. Generally, my logs are nice and quiet, with nice -- MARK -- lines. My syslog, however, is littered with this Sep 23 23:09:01 bookchin /USR/SBIN/CRON[24885]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete > /dev/null) Sep 23 23:09:01 bookchin /USR/SBIN/CRON[24886]: (root) CMD ( [ -d /var/lib/php4 ] && find /var/lib/php4/ -type f -cmin +$(/usr/lib/php4/maxlifetime) -print0 | xargs -r -0 rm > /dev/null) Sep 23 23:17:01 bookchin /USR/SBIN/CRON[24910]: (root) CMD ( cd / && run-parts /etc/cron.hourly) kind of garbage. What's the clean way to avoid it?

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