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  • Why does newline come before space in the output of hexdump?

    - by ??????? ???????????
    Printing these characters in the "Canonical" format gives the output that I expect, while the default format throws me off. $ echo " " |hexdump # Reversed? 0000000 0a20 0000002 $ echo -n " " |hexdump # Ok, fair enough. 0000000 0020 $ echo " " |hexdump -C # Canonical 00000000 20 0a | .| 00000002 With a different string, such as "123" the output is even more confusing: $ echo "123" |hexdump 0000000 3231 0a33 0000004 The output here does not seem "reversed", but rather shuffled. Would anyone care to explain (briefly) what is going on here?

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  • Why are Linux-based operating systems considered safer than Windows?

    - by echoblaze
    I hear that Linux-based systems are better for security. Apparently they don't have viruses and do not need antivirus software. Even my university claims this - they refuse to have Windows on their servers, which is a real shame because we wanted to use the .NET framework to create some websites. The only reason I can see Linux being safer is because it's open-source, so bugs theoretically would get caught and fixed sooner. I know a bit about how operating systems work, but haven't really delved into how Linux and Windows implement their OS. Can someone explain the difference that makes Linux-based systems more secure?

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  • Why won't vsftpd let me log in with a virtual user account?

    - by Ramon
    I would like to use vsftpd with virtual users and pam_pwdfile.so. I installed vsftpd and added two users (ramon and dragon) via htpasswd to my file /etc/vsftpd.passwd. The /etc/pam.d/vsftpd is configured to use this file. auth required pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed auth required pam_pwdfile.so pwdfile /etc/vsftpd.passwd account required pam_permit.so @include common-account @include common-session The user "ramon" is also available in /etc/passwd. A login to the ftp with the user "ramon" works as expected. But a login using "dragon" does not :/ The result is always Login failed: 530 Login incorrect. Since it's possible that I made a mistake I tried the exact way documented in /usr/share/doc/vsftpd/examples/VIRTUAL_USERS/README. Still no luck. I can login with the user "ramon", but not with the user "dragon". Any ideas?

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  • Why did numbered list stop working after I hit Enter?

    - by Michael Leach
    I have a numbered list like: 1.0 Excel 2010 1.1 Introduction to Excel 2010 1.1.A. A general overview of Excel 2010, geared towards beginners 1.1.B. There are 3 videos in this series I put the cursor at the end of the last line on 1.1.B and hit Enter. The next line should begin with 1.1.C but nothing appears when the cursor returns to the next line. Another example, if I put the cursor at the end of 1.1.A and hit enter, I should get a new 1.1.B and the original 1.1.B should be renamed to 1.1.C. After hitting enter, a new 1.1.B doesn't appear and the previous 1.1.B drops all the way to the next page. So the next bullet number that should come up doesn't come up. I tried Microsoft Fix It to reset the Registry and that didn't work either. This is very frustrating. Does anybody know how to fix this?

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  • Why doesn't update-manager allow me to upgrade distribution?

    - by spoulson
    I have an Ubuntu 9.04 PC behind a corporate firewall and proxy server. This requires that in order to get update-manager to fetch and apply updates, I must set the proxy and authentication settings in the Synaptic network configuration. Once done, I can check for updates and things work smoothly (except I don't get popup notifications of new updates, must manually check periodically). However, distribution updates just don't show up in update-manager, such as the newly released 9.10 Karmic Koala. I had the same issue in upgrading 8.10 to 9.04 and solved it by downloading and upgrading from the 9.04 ISO. What do I need to do to upgrade to 9.10 using the standard update-manager UI?

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  • Why does the MSDN library constantly say "Information Not Found"?

    - by Zian Choy
    Environment: VS 2008 Pro SP1 MSDN Library for VS2008SP1 Sample Code: Dim userDataset = New DataSet Dim myDataAdapter = New SqlDataAdapter("SELECT UserName FROM tblwebUsers WHERE name = @person", connect) myDataAdapter.SelectCommand.Parameters.Add("@person", SqlDbType.NVarChar) When I put my cursor on the "d" in "Add" and press F1, I get an "Information Not Found" error from the MSDN Library. Does anyone have any suggestions for addressing the issue?

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  • If I change Windows admin user password, then I can't login to Outlook, why?

    - by Tom
    I am seeing this strange behaviour with Windows 7 and Outlook 2010. If I change the password of User1 (Admin user), login, and start Outlook, it asks for the pasword. It keeps saying "password incorrect". I can login by using same password on the webclient. If I change User1's password back to last one, Outlook starts without any prompting and I'm able to send and receive emails. Is there any link between the user account, its password and the PST file's password?

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  • Why class 'SQLiteDatabase' is not found in /var/www/*.php?

    - by Roman
    I am trying to use sqlite from PHP. I have the following simple code: <?php $db = new SQLiteDatabase("test2.sdb"); unset($db); ?> As the result of this code (which I execute in the command line "php test2.php") I get: Fatal error: Class 'SQLiteDatabase' not found in /var/www/test2.php on line 3 Does anybody know how can I make PHP able to use sqlite? P.S. Here I found out that "SQLite support is enabled by default on a standard Linux PHP compilation starting with PHP 5.0." And I have "PHP Version = 5.2.6-2ubuntu4.6". So, sqlite should be enabled unless the "--disable-sqlite". In my case output of "phpinfo();" does not contain "sqlite" at all.

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  • Why is SMB from a Windows 7 64-bit to OS X Server so slow when using DNS vs IP?

    - by chuboy
    When I connect my 64-bit Windows 7 to a OS X server using \servername, my transfer rates are around 400KB/s. However, when I do the same thing using \192.168.0.10 (which is the IP of the server), transfer rates jump to 30MB/s. All of this happens via a gigabit ethernet cable with my wireless disabled I heard Samba itself "doesn't use DNS", but if that's the case, how am I able to connect to the server in the first place?

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  • Why does Django's dev server use port 8000 by default?

    - by kojiro
    (My question isn't really about Django. It's about alternative http ports. I just happen to know Django is a relatively famous application that uses 8000 by default, so it's illustrative.) I have a dev server in the wild that we occasionally need to run multiple httpd services on on different ports. When I needed to stand a third service up and we were already using ports 80 and 8080, I discovered our security team has locked port 8000 access from the Internet. I recognize that port 80 is the standard http port, and 8080 is commonly http_alt, but I'd like to make the case to our security team to open 8000 as well. In order to make that case, I hope the answer to this question can provide me with a reasonable argument for using port 8000 over 8080 in some case. Or was it just a random choice with no meaning?

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  • Why my hard disk can't boot from the BIOS?

    - by Mario
    I installed a new sata DVD burner. When I turned on the machine (windows 7) it didn't boot. It can boot from a lubuntu CD. There is an option on lubuntu to boot form the first hard disk. If I select it, the machine boots normally to windows 7. So from the CD I can boot but not from the BIOS. I checked all the options more than once: boot from HD, not boot from removable, boot from USB, boot from optical. The order of the boot sequence is HD then DVD. I tried booting only with the HD; I disconnected both DVDs. I even tried recovery of the MBR: bootsect, bootrec, fixmbr, buildbcd, nt60, etc. So, the question is, does this have a reason, what's the difference between booting from the BIOS (as I think) to from the DVD?. The BIOS is intel, it has BIOS codes on the right bottom corner, it stays at 5A for a while. 5A is "Resetting PATA/SATA bus and all devices".

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  • Why does Windows Update download updates for 32-bit Win 7 when I have 64-bit and how to solve it?

    - by verve
    I have my Windows Update set to "I'll choose when to install" instead of updates installing automatically; good thing too because 90% of the updates are for 32-bit systems! Am I suppose to install them? Shouldn't I only install 64-bit version updates? And, how to I make Windows Update download the proper updates only? Side question: Is there a way to "unselect all" in the Windows Update app? Win 7 64-bit. IE 8.

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  • Why have my Aperture referenced files disappeared without trace?

    - by Andy Harvey
    I have an Aperture library that I've been using for several years. In the past week a number of recent photos and movies have mysteriously disappeared. The missing files were all safely imported within the last week (I had reviewed some of the movies within Aperture, so know this to be true). The files were all referenced on an external drive. Within Aperture the files now have a "referenced file can't be found" icon. I've tried searching for the missing files manually, including within the Aperture library package, but they cannot be found anywhere. How can I (a) work out where the missing files have gone, and (b) identify the cause and ensure it doesn't happen again? I'm using Aperture 3.3.2.

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  • Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

    - by John
    We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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  • Why does httpd handle requests for wrong hostnames in SSL mode?

    - by Manuel
    I have an SSL-enabled virtual host for my sites at example.com:10443 Listen 10443 <VirtualHost _default_:10443> ServerName example.com:10443 ServerAdmin [email protected] ErrorLog "/var/log/httpd/error_log" TransferLog "/var/log/httpd/access_log" SSLEngine on SSLProtocol all -SSLv2 SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5 SSLCertificateFile "/etc/ssl/private/example.com.crt" SSLCertificateKeyFile "/etc/ssl/private/example.com.key" SSLCertificateChainFile "/etc/ssl/private/sub.class1.server.ca.pem" SSLCACertificateFile "/etc/ssl/private/StartCom.pem" </VirtualHost> Browsing to https://example.com:10443/ works as expected. However, also browsing to https://subdomain.example.com:10443/ (with DNS set) shows me the same pages (after SSL certificate warning). I would have expected the directive ServerName example.com:10443 to reject all connection attempts to other server names. How can I tell the virtual host not to serve requests for URLs other than the top-level one?

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  • Why would image thumbnails not be showing in all search engines in all browsers?

    - by Edward Tanguay
    For over a week now, when I search for a word at Google, it correctly gives me some preview image thumbnails: But when I click on "images", it doesn't show me any thumbnails: The same thing happens at Bing.com, when I search Bing itself it gives me some thumbnails on the general search result page: But when I click on "images", it doesn't show me any thumbnails: The same thing happens at Yahoo: If I click on one of the broken thumbnails, it shows me the picture fine: Thumbnails at youtube also work fine: It seems each search engine is hanging on different URLs as shown above: t1.gstatic.com ts3.mm.bing.net thm-a02.yimg.com so it doesn't seem to be the problem of one specific URL not sending thumbnails, it is just a problem with search engine image thumbnails in general. Also, this happens in every browser I try: Explorer, Firefox, Chrome. What could be the problem? Is it my computer, some setting somewhere, my router, my Internet provider (T-Online, Germany)? Has anyone ever had this problem and solved it?

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  • Why doesn't apache2 consistently load template fragments from memcached?

    - by Hobhouse
    I run a webserver on an ubuntu box in the rackspacecloud with django 1.0x, apache2/WSGI and memcached 1.2.2. Some of my templates make use of template fragment caching: {% load cache %} {% cache 604800 keyname %} <!-- cache: {% now "H:i, j. b" %} --> {{ my_content }} {% endcache %} When I reload apache2 everything is fine. If keyname is not set, my_content is generated and keyname is set in memcached. After that, my_content is served from memcached. My problem is that after some hours (notably less time than 604800 seconds ), apache2 seems to stop talking to memcached, and my_content is generated from scratch everytime. When this happens I can still set and get keys from memcached from my python shell. Memcached also has more than enough memory to store keys. But to get apache2 to start talking to memcached again I have to restart apache2, and then it will once again start to get the now several hours old keys from memcached. What can be the reason for this behaviour, and how do I fix it?

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  • Why can't I route to some sites from my MacBook Pro that I can see from my iPad?

    - by Robert Atkins
    I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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  • Why does this monitor go to sleep but won't wake up, event though all related power options are turned off?

    - by VoidKing
    We have a machine, Windows 7 (64-bit) with ASUS motherboard, in our building that only sometimes seems to go to sleep, but won't wake up. The machine is still running but shaking the mouse or hitting keys on the keyboard won't wake it up. I have tried for days to isolate the problem, but every time we get to a "let's try this" scenario, it happens again, later. All power options related to display being off are set to never, except the simple, "turn display off after..." setting. That is, the hard drive is set to never turn off, and the computer is set to never sleep nor hibernate. All drivers seem to be up to date, but I am afraid I will hose the machine if I do a BIOS update (plus I figured that will probably have nothing to do with the issue and only make something else break). Wasn't sure if there was something obvious I was missing?

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  • Why does the "Logon Help" dialog show up on every boot?

    - by adietrich
    Every time I boot Windows XP Professional on my notebook, the Logon Help dialog (the one which tells you how to press Ctrl-Alt-Delete) automatically opens. How do I disable this? This did not always happen, but has been going on for quite a while now, with both SP2 and SP3. I'm using the classic logon screen, where you have to type in your username and password.

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  • Why does QuickTime lag in Firefox if I don't put my mouse over it?

    - by Jim McKeeth
    This has happened for me as long as I can remember. Since the first version of Firefox, on multiple computers and under different versions of Windows. QuickTime plays fine in IE and Chrome (even with Firefox in the background), but in Firefox if my mouse is not over the QuickTime window then it will start to studder, then lag and eventually just stop. To be honest, I do keep quite a few tabs open, but Firefox stays at 1% CPU (even when QuickTime runs) and I have a few gigs of free RAM. It is the same for any resolution of video or audio. If the mouse is just one pixel in the client area of the QuickTime then it usually plays fine. Other video formats typically play fine. Does anyone else notice this behavior? Ultimately I would like a fix besides keeping my mouse over the QuickTime window.

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  • Why can a local root turn into any LDAP user?

    - by Daniel Gollás
    I know this has been asked here before, but I am not satisfied with the answers and don't know if it's ok to revive and hijack an older question. We have workstations that authenticate users on an LDAP server. However, the local root user can su into any LDAP user without needing a password. From my perspective this sounds like a huge security problem that I would hope could be avoided at the server level. I can imagine the following scenario where a user can impersonate another and don't know how to prevent it: UserA has limited permissions, but can log into a company workstation using their LDAP password. They can cat /etc/ldap.conf and figure out the LDAP server's address and can ifconfig to check out their own IP address. (This is just an example of how to get the LDAP address, I don't think that is usually a secret and obscurity is not hard to overcome) UserA takes out their own personal laptop, configures authentication and network interfaces to match the company workstation and plugs in the network cable from the workstation to their laptop, boots and logs in as local root (it's his laptop, so he has local root) As root, they su into any other user on LDAP that may or may not have more permissions (without needing a password!), but at the very least, they can impersonate that user without any problem. The other answers on here say that this is normal UNIX behavior, but it sounds really insecure. Can the impersonated user act as that user on an NFS mount for example? (the laptop even has the same IP address). I know they won't be able to act as root on a remote machine, but they can still be any other user they want! There must be a way to prevent this on the LDAP server level right? Or maybe at the NFS server level? Is there some part of the process that I'm missing that actually prevents this? Thanks!!

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