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  • MOSS search crawl fails with "Access is denied ..."

    - by strongopinions
    Recently the search crawler stopped working on my MOSS installation. The message in the crawl log is Access is denied. Check that the Default Content Access Account has access to this content, or add a crawl rule to crawl this content. (The item was deleted because it was either not found or the crawler was denied access to it.) The default content account is an admin on the site collection that I am trying to crawl. Almost every result for this error on Google tells me to add the DisableLoobackCheck registry key with a value of 1. I have done this and rebooted and the error continues. The "Do not allow Basic Authentication" checkbox in my crawl rule screen is unchecked. Is there anything else that could be causing this error? Something with file system or database permissions maybe?

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  • MySQL ERROR 1045 Access Denied

    - by winarm
    Hello- I recently installed MySQL on Fedora13. Now, when I try to create a database, it denies me access. I tried resetting the password and it does not recognize my system root. I tried resetting password with an init-file containing: UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES; I tried uninstall and then reinstall and it is still not working. I am new to Linux and not comfortable with the filesystem. Talk to me like I'm four. Thank you, kindly.

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  • Can Spring access-denied-handler refer to popup?

    - by Rens Groenveld
    I am working with Spring Security 3.1.x and have implemented method annotation securities. As I want, when I perform a certain action while being logged in as a used that doesn't have the rights, I get a 403 acces is denied in my console! Perfect! Now I would like to catch this 403, and give the user a popup with a custom message. I don't want to redirect users to a page saying that they have no rights. Is there any way the access-denied-handler of Spring can take care of a popup? Or can it only redirect to another page? Maybe there are other options for me? Thanks in advance!

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  • VSS Analyze - Access to file [filename] is denied

    - by AJ
    Our VSS database appears to be horribly out of shape. I've been trying to archive and run "analyze" and keep getting "Access to file [filename] is denied. The file may be read-only, may be in use, or you may not have permission to write to the file. Correct this problem and run analyze again." No one is logged into SourceSafe (including myself) and I'm running the analyze utility from the VS command prompt as follows: analyze -v -f -bbackuppath databasepath I get similar errors if I try and create project archives from the ssadmin tool. The database is on a network share, and we're running VSS 2005 v8.0.50727.42. I'd love to be able to do this, as it would be a first step in a move away from VSS. Thanks in advance. More Info Every time I run analyze, the file that spawns the access denied message changes. It's almost as if running analyze unlocks that file so that the next time I get through to the next one.

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  • system() call returns "Permission Denied" on Windows XP

    - by bde
    I am experiencing a problem with a C program running on Windows XP that is getting Permission Denied (EACCES) errors when it tries to call system(). It doesn't seem to matter what I put in the command string, the commands all work manually but get Permission Denied errors when executed via system() The other interesting thing is that the program works correctly on other XP machines, just not this one. That makes it feel like some kind of OS setting, but I am not totally sure what system() does under the hood and would like to understand what is happening here. Thanks.

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  • mysql: Bind on unix socket: Permission denied

    - by Alex
    Can't start mysql with: sudo /usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700 120222 13:40:48 mysqld_safe Starting mysqld daemon with databases from /srv/mysql/myDB 120222 13:40:54 mysqld_safe mysqld from pid file /srv/mysql/pids/mysqld-myDB.pid ended /srv/mysql/logs/mysqld-myDB.log: 120222 13:43:53 mysqld_safe Starting mysqld daemon with databases from /srv/mysql/myDB 120222 13:43:53 [Note] Plugin 'FEDERATED' is disabled. /usr/sbin/mysqld: Table 'plugin' is read only 120222 13:43:53 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 120222 13:43:53 InnoDB: Completed initialization of buffer pool 120222 13:43:53 InnoDB: Started; log sequence number 32 4232720908 120222 13:43:53 [ERROR] Can't start server : Bind on unix socket: Permission denied 120222 13:43:53 [ERROR] Do you already have another mysqld server running on socket: /srv/mysql/sockets/mysql-myDB.sock ? 120222 13:43:53 [ERROR] Aborting 120222 13:43:53 InnoDB: Starting shutdown... One instance mysqld is running: $ ps aux | grep mysql mysql 1093 0.0 0.2 169972 18700 ? Ssl 11:50 0:02 /usr/sbin/mysqld $ Port 3700 is available: $ netstat -a | grep 3700 $ Directory with sockets is empty: $ ls /srv/mysql/sockets/ $ There are all permissions: $ ls -l /srv/mysql/ total 20 drwxrwxrwx 2 mysql mysql 4096 2012-02-22 13:28 logs drwxrwxrwx 13 mysql mysql 4096 2012-02-22 13:44 myDB drwxrwxrwx 2 mysql mysql 4096 2012-02-22 12:55 pids drwxrwxrwx 2 mysql mysql 4096 2012-02-22 12:55 sockets drwxrwxrwx 2 mysql mysql 4096 2012-02-22 13:25 version Apparmor config: $cat /etc/apparmor.d/usr.sbin.mysqld # vim:syntax=apparmor # Last Modified: Tue Jun 19 17:37:30 2007 #include <tunables/global> /usr/sbin/mysqld flags=(complain) { #include <abstractions/base> #include <abstractions/nameservice> #include <abstractions/user-tmp> #include <abstractions/mysql> #include <abstractions/winbind> capability dac_override, capability sys_resource, capability setgid, capability setuid, network tcp, /etc/hosts.allow r, /etc/hosts.deny r, /etc/mysql/*.pem r, /etc/mysql/conf.d/ r, /etc/mysql/conf.d/* r, /etc/mysql/*.cnf r, /usr/lib/mysql/plugin/ r, /usr/lib/mysql/plugin/*.so* mr, /usr/sbin/mysqld mr, /usr/share/mysql/** r, /var/log/mysql.log rw, /var/log/mysql.err rw, /var/lib/mysql/ r, /var/lib/mysql/** rwk, /var/log/mysql/ r, /var/log/mysql/* rw, /{,var/}run/mysqld/mysqld.pid w, /{,var/}run/mysqld/mysqld.sock w, /srv/mysql/ r, /srv/mysql/** rwk, /sys/devices/system/cpu/ r, # Site-specific additions and overrides. See local/README for details. #include <local/usr.sbin.mysqld> } Any suggestions? UPD1: $ touch /srv/mysql/sockets/mysql-myDB.sock $ sudo chown mysql:mysql /srv/mysql/sockets/mysql-myDB.sock $ ls -l /srv/mysql/sockets/mysql-myDB.sock -rw-rw-r-- 1 mysql mysql 0 2012-02-22 14:29 /srv/mysql/sockets/mysql-myDB.sock $ sudo /usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700 120222 14:30:18 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect. 120222 14:30:18 mysqld_safe Logging to '/srv/mysql/logs/mysqld-myDB.log'. 120222 14:30:18 mysqld_safe Starting mysqld daemon with databases from /srv/mysqlmyDB 120222 14:30:24 mysqld_safe mysqld from pid file /srv/mysql/pids/mysqld-myDB.pid ended $ ls -l /srv/mysql/sockets/mysql-myDB.sock ls: cannot access /srv/mysql/sockets/mysql-myDB.sock: No such file or directory $ UPD2: $ sudo netstat -lnp | grep mysql tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1093/mysqld unix 2 [ ACC ] STREAM LISTENING 5912 1093/mysqld /var/run/mysqld/mysqld.sock $ sudo lsof | grep /srv/mysql/sockets/mysql-myDB.sock lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sears/.gvfs Output information may be incomplete. UPD3: $ cat /etc/mysql/my.cnf # # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # # # * IMPORTANT # If you make changes to these settings and your system uses apparmor, you may # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. # user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. #bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 log_error = /var/log/mysql/error.log # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/

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  • Would you re-design completely under .Net?

    - by dboarman
    A very extensive application began as an Access-based system (for database storage). Forms were written in VB5 and/or VB6. As .Net became a fixture in the development community, certain modules have been rewritten. This seems very awkward and potentially costly just to maintain because of the cross-technologies and extra work to keep the two technologies happy with each other. Of course, the application uses a mix of ODBC OleDb and MySql. Would you think spending the time and resources to completely re-develop the application under .Net would be more cost effective? In an effort to develop a more stable application, wouldn't it make sense to use .Net? Or continue chasing Access bugs, adding new features in .Net (which may or may not create new bugs between .Net and Access), and rewriting old Access modules into .Net modules under time constraints that prevent proper design and development? Update The application uses OleDb and MySql - I corrected my previous statement. Also, to lend further support to rewriting: I have since found out that when the "porting" to .Net began, the VBA/VB6 code that existed was basically translated to the .Net equivalent. From my understanding, nothing was done to improve performance, or take advantage of new libraries or technologies. In my opinion, this creates a very fragile and unstable application. With every new update, this becomes more and more visible. As a help desk technician, I have noticed an increase in problems reported. The customers using the software have noticed an increase in problems and are commenting on it.

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  • Amit Jasuja's Session at Gartner IAM with Ranjan Jain of Cisco

    - by Naresh Persaud
    If you did not get a chance to attend Amit Jasuja's session at Gartner IAM this week in Las Vegas, here is a summary of the session and a copy of the slides. The agenda featured an introduction by Ray Wagner, Managing VP at Gartner, followed by Amit discussing the trends in Identity and Access Management shaping Oracle's strategy. Today we are seeing the largest re-architecture in a decade. Every business from manufacturing to retail is transforming the way they do business. Manufacturing companies are becoming manufacturing services companies. Retail organizations are embracing social retail. Healthcare is being delivered on-line around the clock. Identity Management is at the center of the transformation. Whether you are Toyota embracing a social network for cars or launching the next Iphone, the Identity of the user provides context to enable the interaction and secure the experience. All of these require greater attention to the context of the user and externalizing applications for customers and employees.  Ranjan discussed how Cisco is transforming  by integrating 1800 applications to a single access management framework and consolidating 3M users across 4 data centers to support internal and external processes. David Lee demonstrated how to use Oracle Access Manager 11g R2 on a mobile application to sign-on across multiple applications while connecting mobile applications to a single access control policy.

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  • Two views of Federation: inside out, and outside in

    - by Darin Pendergraft
    IDM customers that I speak to have spent a lot of time thinking about enterprise SSO - asking your employees to log in to multiple systems, each with distinct hard to guess (translation: hard to remember) passwords that fit the corporate security policy for length and complexity is a strategy that is just begging for a lot of help-desk password reset calls. So forward thinking organizations have implemented SSO for as many systems as possible. With the mix of Enterprise Apps moving to the cloud, it makes sense to continue this SSO strategy by Federating with those cloud apps and services.  Organizations maintain control, since employee access to the externally hosted apps is provided via the enterprise account.  If the employee leaves, their access to the cloud app is terminated when their enterprise account is disabled.  The employees don't have to remember another username and password - so life is good. From the outside in - I am excited about the increasing use of Social Sign-on - or BYOI (Bring your own Identity).  The convenience of single-sign on is extended to customers/users/prospects when organizations enable access to business services using a social ID.  The last thing I want when visiting a website or blog is to create another account.  So using my Google or Twitter ID is a very nice quick way to get access without having to go through a registration process that creates another username/password that I have to try to remember. The convenience of not having to maintain multiple passwords is obvious, whether you are an employee or customer - and the security benefit of not having lots of passwords to lose or forget is there as well. Are enterprises allowing employees to use their personal (social) IDs for enterprise apps?  Not yet, but we are moving in the right direction, and we will get there some day.

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  • How to access remote lan machines through a ipsec / xl2ptd vpn (maybe iptables related)

    - by Simon
    I’m trying to do the setup of a IPSEC / XL2TPD VPN for our office, and I’m having some problems accessing the remote local machines after connecting to the VPN. I can connect, and I can browse Internet sites trough the VPN, but as said, I’m unable to connect or even ping the local ones. My Network setup is something like this: INTERNET eth0 ROUTER / VPN eth2 LAN These are some traceroutes behind the VPN: traceroute to google.com (173.194.78.94), 64 hops max, 52 byte packets 1 192.168.1.80 (192.168.1.80) 74.738 ms 71.476 ms 70.123 ms 2 10.35.192.1 (10.35.192.1) 77.832 ms 77.578 ms 77.865 ms 3 10.47.243.137 (10.47.243.137) 78.837 ms 85.409 ms 76.032 ms 4 10.47.242.129 (10.47.242.129) 78.069 ms 80.054 ms 77.778 ms 5 10.254.4.2 (10.254.4.2) 86.174 ms 10.254.4.6 (10.254.4.6) 85.687 ms 10.254.4.2 (10.254.4.2) 85.664 ms traceroute to 192.168.1.3 (192.168.1.3), 64 hops max, 52 byte packets 1 * * * 2 *traceroute: sendto: No route to host traceroute: wrote 192.168.1.3 52 chars, ret=-1 *traceroute: sendto: Host is down traceroute: wrote 192.168.1.3 52 chars, ret=-1 * traceroute: sendto: Host is down 3 traceroute: wrote 192.168.1.3 52 chars, ret=-1 *traceroute: sendto: Host is down traceroute: wrote 192.168.1.3 52 chars, ret=-1 These are my iptables rules: iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT # allow lan to router traffic iptables -A INPUT -s 192.168.1.0/24 -i eth2 -j ACCEPT # ssh iptables -A INPUT -p tcp --dport ssh -j ACCEPT # vpn iptables -A INPUT -p 50 -j ACCEPT iptables -A INPUT -p ah -j ACCEPT iptables -A INPUT -p udp --dport 500 -j ACCEPT iptables -A INPUT -p udp --dport 4500 -j ACCEPT iptables -A INPUT -p udp --dport 1701 -j ACCEPT # dns iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 53 -j ACCEPT iptables -A INPUT -s 192.168.1.0/24 -p udp --dport 53 -j ACCEPT iptables -t nat -A POSTROUTING -j MASQUERADE # logging iptables -I INPUT 5 -m limit --limit 1/min -j LOG --log-prefix "iptables denied: " --log-level 7 # block all other traffic iptables -A INPUT -j DROP And here are some firewall log lines: Dec 6 11:11:57 router kernel: [8725820.003323] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=192.168.1.3 LEN=60 TOS=0x00 PREC=0x00 TTL=255 ID=62174 PROTO=UDP SPT=61910 DPT=53 LEN=40 Dec 6 11:12:29 router kernel: [8725852.035826] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=15344 PROTO=UDP SPT=56329 DPT=8612 LEN=24 Dec 6 11:12:36 router kernel: [8725859.121606] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=11767 PROTO=UDP SPT=63962 DPT=8612 LEN=24 Dec 6 11:12:44 router kernel: [8725866.203656] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=11679 PROTO=UDP SPT=57101 DPT=8612 LEN=24 Dec 6 11:12:51 router kernel: [8725873.285979] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=39165 PROTO=UDP SPT=62625 DPT=8612 LEN=24 I’m pretty sure that the problem should be related with iptables, but after trying a lot of different confs, I was unable to find the right one. Any help will be greetly appreciated ;). Kind regards, Simon. EDIT: This is my route table: default 62.43.193.33.st 0.0.0.0 UG 100 0 0 eth0 62.43.193.32 * 255.255.255.224 U 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth2 192.168.1.81 * 255.255.255.255 UH 0 0 0 ppp0

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  • Microsoft Access 2007 Certification

    Certification doesn't make one an IT super hero but it's something every developer should consider. Some might argue that there aren't any certifications for Microsoft Access application developers and they would be correct, however, the Microsoft Access 2007 Application Specialist (MCAS) exam might prove helpful.

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  • SQLAuthority News MS Access Database is the Way to Go April 1st Humor

    First of all, today is April 1- April Fools Day, so I have written this post for some light entertainment. My friend has just sent me an email about why a person should go for Access Database. For a short background, I used to be an MS Access user once (I will not call myself [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Microsoft Access 2000 How To's Series

    Listen Software Solutions and author David Nishimoto present a new series designed to help Microsoft Access developers discover the secrets of Access programming and empower the developer with the critical knowledge needed to build enterprise-quality applications.

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  • Apache 'You don't have permission to access / on this server'

    - by Dying
    I just install apache2 on ubuntu,the default www directory is /var/www/ ,I use ln to link it to '/media/Software/Program Files/wamp/www/' at the windows directory,but the apache shows 'You don't have permission to access / on this server',Then I use 'sudo chmod -R 777 /media/Software/Program\ Files/wamp/www/' to set the permission,but it didn't work,and nothing changed when I saw the permission in the preporties of the '.../wamp/www' folder.So I want to know How can I change the www directory to '.../wamp/www' as I also need to access this diretory in windows.

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  • SQL Server 2008 R2: StreamInsight changes at RTM: Access to grouping keys via explicit typing

    - by Greg Low
    One of the problems that existed in the CTP3 edition of StreamInsight was an error that occurred if you tried to access the grouping key from within your projection expression. That was a real issue as you always need access to the key. It's a bit like using a GROUP BY in TSQL and then not including the columns you're grouping by in the SELECT clause. You'd see the results but not be able to know which results are which. Look at the following code: var laneSpeeds = from e in vehicleSpeeds group e...(read more)

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  • Root cannot access /dev/urandom

    - by Darren Newton
    I am trying to generate a GPG key, and I cannot generate enough entropy. So I installed rng-tools and tried following these instructions: http://serverfault.com/questions/214605/gpg-not-enough-entropy When I am logged in as root, and try to run rngd -r /dev/urandom I get the following error: can't open /dev/random: Permission denied I find this disturbing as I am root. This is Ubuntu on a virtual server (via Parallels I believe.)

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  • Google Webmaster Central tells me that robots is blocking access to the sitemap

    - by Gaia
    This is my robots.txt User-agent: * Disallow: /wp-admin/ Disallow: /wp-includes/ Sitemap: http://www.mydomain.org/sitemap.xml.gz But Google Webmaster Central tells me that robots is blocking access to the sitemap: We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit: URL restricted by robots.txt I read that Google Webmaster Central caches robots.txt, but the file has been updated more than 10 hours ago.

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  • VPN says "successfully connected" and I'm internet-connected, but I can't access network resources

    - by Al S.
    To explain, I'm a university student who uses the VPN to access sites like Nature, PhysicsToday, etc. I have this VPN working on Windows 7 and I've got access to nearly every journal. However on my Ubuntu 12.04 partition I'm able to connect to the internet (in fact I'm typing this while connected through the VPN presumably) but journals have locked me out. Is there a problem on my end that I can fix?

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  • What's new in Access 2010

    Wonder what turn Access will take in Microsoft Office 2010? Danny Lesandrini explores how the new Access looks and feels, what can and can't be done with it and how steep the new learning curve is going to be.

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  • How to use Chrome to access Oracle Applications

    - by Pan.Tian
    So far,Chrome browser is still not certified by Oracle Application, so you can not access Oracle Apps via Chrome.But you can install a chrome Extension to access Oracle Application(It works fine for 11i or R12 instance) Chrome Plugin:Oracle EBS R12 Enablement for Chrome You can use this Chrome Extension to log in Oracle E-Business R12 Form UI without FRM-92129(or FRM-92120) error which say the file Registry.dat lost. Plugin Author: zorrofox (see:http://www.itpub.net/forum.php?mod=viewthread&tid=1724526&page=1#pid20409128)

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  • Memory read/write access efficiency

    - by wolfPack88
    I've heard conflicting information from different sources, and I'm not really sure which one to believe. As such, I'll post what I understand and ask for corrections. Let's say I want to use a 2D matrix. There are three ways that I can do this (at least that I know of). 1: int i; char **matrix; matrix = malloc(50 * sizeof(char *)); for(i = 0; i < 50; i++) matrix[i] = malloc(50); 2: int i; int rowSize = 50; int pointerSize = 50 * sizeof(char *); int dataSize = 50 * 50; char **matrix; matrix = malloc(dataSize + pointerSize); char *pData = matrix + pointerSize - rowSize; for(i = 0; i < 50; i++) { pData += rowSize; matrix[i] = pData; } 3: //instead of accessing matrix[i][j] here, we would access matrix[i * 50 + j] char *matrix = malloc(50 * 50); In terms of memory usage, my understanding is that 3 is the most efficient, 2 is next, and 1 is least efficient, for the reasons below: 3: There is only one pointer and one allocation, and therefore, minimal overhead. 2: Once again, there is only one allocation, but there are now 51 pointers. This means there is 50 * sizeof(char *) more overhead. 1: There are 51 allocations and 51 pointers, causing the most overhead of all options. In terms of performance, once again my understanding is that 3 is the most efficient, 2 is next, and 1 is least efficient. Reasons being: 3: Only one memory access is needed. We will have to do a multiplication and an addition as opposed to two additions (as in the case of a pointer to a pointer), but memory access is slow enough that this doesn't matter. 2: We need two memory accesses; once to get a char *, and then to the appropriate char. Only two additions are performed here (once to get to the correct char * pointer from the original memory location, and once to get to the correct char variable from wherever the char * points to), so multiplication (which is slower than addition) is not required. However, on modern CPUs, multiplication is faster than memory access, so this point is moot. 1: Same issues as 2, but now the memory isn't contiguous. This causes cache misses and extra page table lookups, making it the least efficient of the lot. First and foremost: Is this correct? Second: Is there an option 4 that I am missing that would be even more efficient?

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  • Intégrez les commandes des menus Access dans vos applications, par Dominique Kirchhofer

    Bonjour, Je vous propose un article qui présente les commandes les plus courantes des menus Access et comment les exécuter avec Visual Basic. Access : les commandes intégrées des menus Plutôt réservé aux débutants, j'espère néanmoins que chacun y trouvera des informations intéressantes. Toutes critiques ou suggestions d'amélioration sont bienvenues. Je vous souhaite une bonne lecture. Domi2...

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  • Methods to access US Netflix from Chromecast?

    - by lfk
    I need to access US Netflix using Chromecast but changing router configuration is not an option (I don't have access to the wireless router). On my laptop I use VPN, so one option is to use my laptop as a hotspot, but I don't always have cable connection for my laptop. Besides I was hoping to need only my iPad to use the Chromecast. Is there any other way or should I return the Chromecast while I still can?

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  • WordPress - Emergency Access Without Admin Accounts

    In some cases, when you need to do something in a WordPress website, but all you have is only access to WordPress database and FTP, and you cannot get the admin password from the database because it's decrypted. All changes you have to make via some low level MySQL queries, it's hard and easy mistaken. Joost de Valk has written a script for emergency access to WordPress dashboard by changing admin password or creating new user.

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