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  • Redundant Router and Load Balancing vs. DDoS attack

    - by colgatta
    With a small server farm at a hoster with great support and conditions, I worry about the increasing number of DDoS attacks against this hoster (not my web project, but other clients on the same location). I have booked a redundant router and load balancer as managed service with this hoster to share the load with all the dedicated servers. However, I was lost again today because another one's project was attacked with DDoS for hours :-( Each hour means hundreds of dollars loss whenever my adserver and tracking is not reachable. Even time-out advertising have to be paid by me but can not be resold to my clients without the servers being available. All the time, the servers, the load and traffic is OK and health, but no chance to keep this stable/online if the hoster is vulnerable. Anyone has ideas or suggestions how to protect - even against DDoS?

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  • Nginx deny doesn't work for folder files

    - by user195191
    I'm trying to restrict access to my site to allow only specific IPs and I've got the following problem: when I access www.example.com deny works perfectly, but when I try to access www.example.com/index.php it returns "Access denied" page AND php file is downloaded directly in browser without processing. I do want to deny access to all the files on the website for all IPs but mine. How should I do that? Here's the config I have: server { listen 80; server_name example.com; root /var/www/example; location / { index index.html index.php; ## Allow a static html file to be shown first try_files $uri $uri/ @handler; ## If missing pass the URI to front handler expires 30d; ## Assume all files are cachable allow my.public.ip; deny all; } location @handler { ## Common front handler rewrite / /index.php; } location ~ .php/ { ## Forward paths like /js/index.php/x.js to relevant handler rewrite ^(.*.php)/ $1 last; } location ~ .php$ { ## Execute PHP scripts if (!-e $request_filename) { rewrite / /index.php last; } ## Catch 404s that try_files miss expires off; ## Do not cache dynamic content fastcgi_pass 127.0.0.1:9001; fastcgi_param HTTPS $fastcgi_https; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; ## See /etc/nginx/fastcgi_params } }

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  • What about IPv4 class E?

    - by Luc
    IPv4's class E network (240.0.0.0/4) contains 268 million addresses. Despite the advertisements for IPv6, claiming we have ran out of address space, this block ironically still claims to be "Reserved for future use". Why hasn't this block been freed up yet? Of course, IPv6 should be promoted instead of freeing up more IPv4 addresses, but we've seen the address shortage coming for years. There has even been a time they weren't sure there was enough time to develop IPv6 before we would run out of addresses. Why didn't they free up this block already? And is there any chance these addresses will be used in the future, like when IPv6 is fairly widely implemented but we still need IPv4 for backwards compatibility? It will be phased out regardless, but then ISPs don't have to employ NAT for IPv4 compatibility.

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  • A raw dump from a corrupted large file

    - by Masoud M.
    I have a large .rar file inside partion D (Windows7/NTFS). It's corrupted due to bad sector (I think) and when I copy it to another place (External-HDD) the system freezes after 88% of progress. I even tried to copy it with my Ubuntu and same problem occurred. Also I tried chkdsk and it dosen't fix it. I think my last chance is dump that file with a tool which ignores bad sectors and create a raw copy of it. Then I will repair the file with rar tools. But I can not found a tool to raw dump a specific file. (In linux there is dd tool but it dumps all partition and I can not use it) So, Is somebody know a tool to do a raw dump from a file?

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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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  • Windows shutting down, CPU maxing out in Windows-7 32-bit? [closed]

    - by Vivek Sharma
    I have no idea, what is happening to my laptop. For last 5-6 times it has automatically shutdown while running, without doing anything serious. And I even do get the message during boot which says - Start windows normal - Start in safe mode It just boots up normal. Few days ago, my screen blinked and it the PC shutdown immediately. After that I was not able to get it started. I got it repaired, the guy said he has replaced the display chip (nVidia-nvs-140), but i seriously doubt that. Now it started working, but would shutdown every 20 mins or so. I have a dual boot, ubuntu-11.10 works just fine. Virus scan on windows shows nothing. I am pasting my perfmon output. My CPU for reason is maxing out to 100% continously, for windows internal processes. Please have a look at the attached file. Strangly now for last 2 hours it is working fine, but i am just writing emails and reading excels. ThinkPad T61 | t9300 | 3gb | nVidia 140 nvs-quadro (latest driver 296.10) What do you suggest?

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  • How to watch disk free space change on Linux?

    - by Bob
    As the title implies, I want to know how to watch disk free space change on Linux instead polling it periodically via statfs. When the free space is changed, a signal is emitted to allow the application having a chance to handle the change event. On Windows, it can be done by FindFirstChangeNotification with FILE_NOTIFY_CHANGE_SIZE. When the free space is changed, the HANDLE object returend by FindFirstChangeNotification gets signaled and let application do something. Is there any similar way to do that on Linux? Thanks.

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  • Can't reinstall Office 2010

    - by Sniffer
    I had Office 2010 Professional Plus installed on my Windows 7 (32 bit machine), then I decided to remove it and install the 2013 version. I went to Programs and Features and removed the software as always, everything went successfully and it asked me to reboot the machine in order to complete the un-installation process, and when I clicked reboot a message suddenly appears telling me that an error occurred during un-installation and the system restarts instantly before I get a chance to see the error message. After that I tried to re-install Office 2010 but after the installer seems to have finished, it tells me that the installation failed without an explanations ? I have taken a look at the event viewer and there is some error saying the office protection platform service failed to start, could this have anything to do with the problem? What could be the cause, how can I fix this ?

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  • Google Chrome gets really slow on 10+ open tabs

    - by Anton
    For some time already I face a problem with Google Chrome. I really love this browser, but on Windows 7 on a pretty decent machine (i5, 4GB RAM) it gets REALLY slow when I open for instance 10 techcrunch.com pages. Once I do that it becomes virtually difficult to scroll through pages and the general responsiveness of the browser gets down. And if I open 20+ or 30+ tabs there is a good chance all of them will crash. Does anyone got an idea? This happens to me on several PCs with Windows 7 64bit. At 10 tabs there is 600-700MB memory used by Chrome. Two systems have the issue are both laptops with integrated graphics. One by Intel, the other an nVidia GeForce 310M.

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  • 'Slow down' A DHCP server on purpose.

    - by Ced
    As the title implies, May look like a silly question, But what i'm trying to do, Is to have 2 DHCP servers in one network. One only leases IPs to Bootp clients (And if the client re-requests immediately after leases again) And one DHCP server, which is builtin with my PFsense router, that leases the non-bootp clients so they can access the internet and other network resources. I know by chance that PFsense uses ISC-DHCPd. Maybe they have a delay option? All i need to do to make sure the bootp/PXE boot clients get the proper address, is slow down the DHCP server in the PFsense box. Question is how. Anyone ideas? Thanks in advance

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  • Windows 7 Update freezes - what to do?

    - by Tom Tom
    Hi, Yesterday I shutdown my notebook, and Windows 7 Ultimate started to install automatic updates. After one hour, I noticed that the update was still running. I thought OK, I shall go to sleep and let it run. In the morning it was still running. Thus, I thought it had crashed, forced a shutdown of the notebook and then restarted it. With the same effect that the notebook is "freezing" at "Install Update 1 of 5". It does not look like it has crashed. The progress wheel is still moving. But it does not make any progress... Would appreciate any help! Edit: OK, I was able to log-in into safe mode. This way I passed the install update screen. I do not want to generally disable updates, what can I do to not install the last update, which is creating troube. Or how can I find out whats the problem with the last update?

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  • Using wifi router as bridge to increase signal?

    - by overtherainbow
    A friend of mine lives in an appartment building whose structure is such that wifi signal is very weak. Even a USB key won't work. I was thinking of buying an entry-level wifi router and reconfigure it as a bridge to act as repeater. Would that increase the chance of getting a good signal, or I shouldn't bother? If experience shows that it does improve things significantly, is their another router I should look at besides the Linux-based Linksys models? Thank you.

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  • Is there any way to tweak / rotate mouse orientation? Any applications? Registry edits?

    - by calbar
    I've got a very frustrating issue with my new Logitech Marathon Mouse M705. It is absolutely perfect for what I need, with the exception that it tracks on an angle for some reason. What I mean is when you slide the cursor to the left, it trends upward - when you slide to the right, it trends down. Moving the cursor along a flat horizontal line is no longer a natural motion - you need to fight what I suspect is a mechanical error of some kind. Unfortunately, I've already exchanged this mouse once and tested both on different Windows 7 and Mac OS X machines - the problem continues to occur. Is there a software solution for me? I'm incredibly surprised there is no simple way to adjust the orientation... how can every mouse manufacturer possibly adjust their hardware to track to everyone's tastes? What about those who need to flip orientation a full 90 or 180 degrees? I only need to adjust mine a few degrees, but I'm sure that need has arisen as well. Anyway, I'm running the latest SetPoint drivers (6.00) on Windows 7 and there are no orientation options available. I've checked out uberOptions and the M705 isn't supported yet (with the last version update over 6 months ago). MAF Mouse instructions are a very strange series of mouse clicks to activate. This app also seems a little overkill and costs $$ (which I'm willing to pay as a last resort). Is there no universal registry value for mouse orientation? How about for SetPoint drivers specifically? I've done a simple search in regedit without any luck. An XML file somewhere? Anything?

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  • Why some recovery tools are still able to find deleted files after I purge Recycle Bin, defrag the disk and zero-fill free space?

    - by Ivan
    As far as I understand, when I delete (without using Recycle Bin) a file, its record is removed from the file system table of contents (FAT/MFT/etc...) but the values of the disk sectors which were occupied by the file remain intact until these sectors are reused to write something else. When I use some sort of erased files recovery tool, it reads those sectors directly and tries to build up the original file. In this case, what I can't understand is why recovery tools are still able to find deleted files (with reduced chance of rebuilding them though) after I defragment the drive and overwrite all the free space with zeros. Can you explain this? I thought zero-overwritten deleted files can be only found by means of some special forensic lab magnetic scan hardware and those complex wiping algorithms (overwriting free space multiple times with random and non-random patterns) only make sense to prevent such a physical scan to succeed, but practically it seems that plain zero-fill is not enough to wipe all the tracks of deleted files. How can this be?

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  • Is there an application to log component temperatures to file?

    - by MrVimes
    I purchased a computer a month or two ago (core i7, 24gb ram, geforce gtx 590, windows 7 ultimate). Within the last week it began to bluescreen regularly. I tried lots of things (check hds, check memory, reinstall windows etc..) but it still bluescreened. At the time my temps were as follows... CPU - aprox 40/50c. GPU - arpox 60 idle, aprox 90 during heavy use. HDDs - aprox 55c after the PC had been on a while. I thought the 55c was ok, but I have since realized it was probably too high and may have been the direct cause of the bluescreening. I've installed a spare fan I had in the front of the PC blowing air in, (so there's airflow from front to back) Since then, obviously, all my temps are down. Especially the HDDs - three of them reach 30c and one has been up to 47c (it is some distance away from the airflow, in one of the 5.25inch drive bays) I haven't had the PC on for as long as it would normally take to bluescreen yet, but If it does I want to know what all the temps were right before the bluescreen. I have tried Everest but it only shows me realtime temps or gives me the ability to create one-off reports. I want something that can record all the temps to a file at 30 seconds intervals. If the computer bluescreens I can load it up again and check the last entry in the file. Side question: Am I right in thinking 55c was far too hot for a HDD? (It might have got higher than that before the bluescreens.. I don't know) Another side question: Is 47c too high? This is actually why I am asking the main question - I am concerned that this one drive that isn't getting the benefit of the extra fan may still cause the computer to bluescreen.

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  • Restore SBS 2003 CompanyWeb calendar from flat files?

    - by BrandonS
    Ok so I have a job of recovering a calendar that was used for an event schedule. The situation is that there was never a backup done except for using Carbonite on the C drive. I have re-installed the server with the same server name and domain. I tried stopping the mssqlsharepoint service and over-righting the two DB files (STS_1.mdf and STS_1_log.LDF) and each one individually each time stopping and restarting the service. Now I knew before I started that this had a slim chance of working but I had to try because everything else i could find involved backing up before restoring and this just wasn't done. Please someone help it is driving me mad I tell you MADDDDDD. ps i am not the genius that set this up just the fool tasked to clean up the mess. :-)

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  • jdbc4 CommunicationsException

    - by letronje
    I have a machine running a java app talking to a mysql instance running on the same instance. the app uses jdbc4 drivers from mysql. I keep getting com.mysql.jdbc.exceptions.jdbc4.CommunicationsException at random times. Here is the whole message. Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was25899 milliseconds ago.The last packet sent successfully to the server was 25899 milliseconds ago, which is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. For mysql, the value of global 'wait_timeout' and 'interactive_timeout' is set to 3600 seconds and 'connect_timeout' is set to 60 secs. the wait timeout value is much higher than the 26 secs(25899 msecs). mentioned in the exception trace. I use dbcp for connection pooling and here is spring bean config for the datasource. <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource" > <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/db"/> <property name="username" value="xxx"/> <property name="password" value="xxx" /> <property name="poolPreparedStatements" value="false" /> <property name="maxActive" value="3" /> <property name="maxIdle" value="3" /> </bean> Any idea why this could be happening? Will using c3p0 solve the problem ?

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  • Recommended Smartphone for Reading PDFs [closed]

    - by mika
    This is as much a software than a hardware question. I use a lot of public transport and perhaps the best way to spend your time there is to read while listening to music. Currently I use Nokia E90 and Adobe Reader LE 2.5 (full version). I was wondering if there are any better alternatives? Requirements: at least 640px wide screen, preferably 800px physical size of the LCD display matters, it should be large, but the phone itself should be as small as possible. This favors touchscreen models PDF reader should be of high quality. It should render most PDFs correctly. Other important features include: full screen mode, keyboard controls for Page Down and page change, multiple zoom levels to adjust to the screen, opening recent documents at the last page read Downsides of E90 + Adobe Reader LE Phone is large compared to the display It is hard to read the display at sunlight Adobe Reader crashes the phone regularly, zoom could have more levels, doesn't remember last page EDIT: Switched to iPhone and GoodReader. Smaller physical screen width compared to E90 is a disimprovement, but other than that I'm happy. GoodReader is the highest quality smartphone PDF reader I've seen so far.

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  • realtek lan driver problem - win 7

    - by tango _123
    Hi, my new notebook (ACER TM 8371) with Win 7(x32) professional as OS, has strage behaviour with respect to LAN. when I plug or unplug my charger cable, or my notebook goes in stad-by, or just a do nothing, the netwrok connection is lost. All the energy savings functionbality have been in-activated. if i check the network adapter information, it says "a network cabel is unplugged or corrupted", but it is not true.....the cable is in and it is not corrupted (i tried several which works on other machines). if a tried to di-habilitate and hence re-habilitate, it allows di-habilitation and not to further re-habilitate (it says "no driver for the network card" are available). in some cases, also, the driver disappears (i cannot see it anylonger). if i restart the notebook, everything comes back to normality, but.....today in 3 hours i had to restart 6 times!!! can anyone help me? win 7 says the driver is the last one, so no need to update it. here are some techinical information aboiut network card and driver: Name [00000015] Realtek PCIe GBE Family Controller Adapter type Ethernet 802.3 Product type Realtek PCIe GBE Family Controller Installated YES ID device PNP PCI\VEN_10EC&DEV_8168&SUBSYS_02831025&REV_02\4&266E4C4F&0&00E2 last reset 20/11/2009 11:27 Index 15 Service name RTL8167 I/O Port 0x0000FF00-0x0000FFFF Memory address 0xE2500000-0xE2500FFF Memory address 0xE1400000-0xE140FFFF IRQ Channel IRQ 18 Driver c:\windows\system32\drivers\rt86win7.sys (7.3.522.2009, 164,00 KB (167.936 Byte), 28/08/2009 22:12)

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  • Host couldn't be reached by domain name, only by IP: Apache's fault?

    - by MaxArt
    I have this Windows Server 2003 R2 32 bit machine running Apache 2.4.2 with OpenSSL 1.0.1c and PHP 5.4.5 via mod_fcgid 2.3.7. This config worked just fine for some hours, but then the site couldn't be reached with its domain name, say www.example.com, but it could be still reached by its IP address. In particular, while https://www.example.com/ yielded a connection error, http://123.1.2.3/ worked just fine. Yes, first https then http. Error and access logs were clean, i.e. they showed no signs of problems. Just the usual messages, that were interrupted while the site couldn't be reached. After some investigation, a simple restart of Apache solved the problem. Unfortunately, I didn't have the chance to test if https://123.1.2.3/ worked as well, or if http://www.example.com/ was still redirected to https as usual. So, has anyone have any idea of what happened? Before I get tired of Apache and ditch it in favor of Nginx? Edit: Some log informations. The last line of sslerror.log is from 90 minutes before the problem occurred, so I guess it's not important. ssl_request.log shows nothing interesting, too: these are the last two lines before the problem: [28/Aug/2012:17:47:54 +0200] x.x.x.x TLSv1.1 ECDHE-RSA-AES256-SHA "GET /login HTTP/1.1" 1183 [28/Aug/2012:17:47:45 +0200] y.y.y.y TLSv1 ECDHE-RSA-AES256-SHA "POST /upf HTTP/1.1" 73 The previous lines are all the same and don't seem interesting, except 4 lines like these 30-40 seconds before the problem: [28/Aug/2012:17:47:14 +0200] z.z.z.z TLSv1 ECDHE-RSA-AES256-SHA "-" - These are the corrisponding lines from sslaccess.log: z.z.z.z - - [28/Aug/2012:17:47:14 +0200] "-" 408 - ... x.x.x.x - - [28/Aug/2012:17:47:54 +0200] "GET /login HTTP/1.1" 200 1183 y.y.y.y - - [28/Aug/2012:17:47:45 +0200] "POST /upf HTTP/1.1" 200 73

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  • recover deleted files from other computer

    - by Giorgi
    Hello, I moved a html file from my computer to another and accidentally deleted it from that computer which I accessed from my computer like this: \name\folder As a result the file did not go recycle bin. I tried ntfsundelete and it did found the file on my computer but when I recovered, it looks like as if you opened binary file with notepad. I then tried Recuva and it says that part of the file is overwritten. Is there any chance to recover it? Can I recover it from another computer? Thanks.

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  • Setting up a linux switch

    - by Shahmir Javaid
    I have a C++ Program to sniff each and every packet that crosses my linux box. However i need to now get my linux box to listen to every traffic in my network. I could buy a managed switch and set up port spanning, but i aint paying 200+ £'s for a switch and plus gives me a chance to learn. My Network +---------Computer A | Internet-----Router------Switch-------------+---------Linux Box | +---------Computer B Proposed Network +---------Computer A | Internet-----Router------Linux Box--------Switch eth0^ ^eth1 | +---------Computer B How would i setup this in linux. Do i just configure both the ethernet on different IP Address on the same network. Or am i completelly on the wrong track My System Fedora 13. Thanks

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  • Security considerations for my first eStore.

    - by Rohit
    I have a website through which I am going to sell few products. It is hosted on a simple shared-hosting and does not have SSL. On the products page, each product has a Buy Now button created from my PayPal Merchant account. PayPal recommends to use it's Button Factory to create secure buttons and save it inside PayPal itself. I have followed the same advice and the code of any button is secure and does not disclose any information on either a product or it's price. When the user clicks on a Buy Now button, he/she is taken to PayPal site where a page is opened in SSL for the user to fill in the credit card and shipping details. After a successful transaction, the control is passed back to my site. I want to know whether there is still any chance when security could be compromised.

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  • when connected to vpn, can't access certain things

    - by shsteimer
    my companies vpn is not a standard windows vpn. It uses Juniper Networks and it intalls locally something called "Host Checker" prior to allowing me to connect. I have noticed 2 things that I can't access while on vpn. etrade.com - no idea why this specific website, but I can't get to it, maybe https? use of my magik jack - I'm assuming this is some sort of a port conflict issue. if im on a call when i connect, i lose all reception. if i try to make a call after conected, ic an't even get it to dial. Can anyone tell me how I would even begin to debug this. I expect if I call the help desk they won't be much help, but if I can tell them the specific problems of conflicts, maybe I have a chance of them working with me to get it working.

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  • Dealing with LDAP failure when using it for PAM/NSS?

    - by Insyte
    I use a redundant pair of OpenLDAP servers for PAM auth and directory services via NSS. It's been 100% reliable so far, but nothing runs flawlessly forever. What steps should I take now so I have a fighting chance of recovering from failure of the LDAP server(s)? In my informal testing, it appears that even already authenticated shells are largely useless as all username/uid lookups hang until the directory server comes back. So far I've come up with only two things: Do not use NSS-LDAP and PAM-LDAP on the LDAP servers themselves. Create a root-level account on all boxes that only accepts publickey authentication from our local subnet and protect that key well. I'm not sure how much good this would do me as once I'm logged in, I suspect I wouldn't be able to accomplish anything since all the userid lookups would be hanging. Any other suggestions?

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