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Articles indexed Sunday June 8 2014

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• Improving TCP performance over a gigabit network lots of connections and high traffic for storage and streaming services

  - by Linux Guy

  I have two servers, Both servers hardware Specification are Processor : Dual Processor RAM : over 128 G.B Hard disk : SSD Hard disk Outging Traffic bandwidth : 3 Gbps network cards speed : 10 Gbps Server A : for Encoding videos Server B : for storage videos andstream videos over web interface like youtube The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos Both servers in same network , when i do ping from Server A to Server B i got high time latency above 1.0ms , the time range time=52.7 ms to time=215.7 ms - This is the output of iftop utility 353Mb 707Mb 1.04Gb 1.38Gb 1.73Gb mqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqqqqqqqqqqq server.example.com => ip.address 6.36Mb 4.31Mb 1.66Mb <= 158Kb 94.8Kb 35.1Kb server.example.com => ip.address 1.23Mb 4.28Mb 1.12Mb <= 17.1Kb 83.5Kb 21.9Kb server.example.com => ip.address 395Kb 3.89Mb 1.07Mb <= 6.09Kb 109Kb 28.6Kb server.example.com => ip.address 4.55Mb 3.83Mb 1.04Mb <= 55.6Kb 45.4Kb 13.0Kb server.example.com => ip.address 649Kb 3.38Mb 1.47Mb <= 9.00Kb 38.7Kb 16.7Kb server.example.com => ip.address 5.00Mb 3.32Mb 1.80Mb <= 65.7Kb 55.1Kb 29.4Kb server.example.com => ip.address 387Kb 3.13Mb 1.06Mb <= 18.4Kb 39.9Kb 15.0Kb server.example.com => ip.address 3.27Mb 3.11Mb 1.01Mb <= 81.2Kb 64.5Kb 20.9Kb server.example.com => ip.address 1.75Mb 3.08Mb 2.72Mb <= 16.6Kb 35.6Kb 32.5Kb server.example.com => ip.address 1.75Mb 2.90Mb 2.79Mb <= 22.4Kb 32.6Kb 35.6Kb server.example.com => ip.address 3.03Mb 2.78Mb 1.82Mb <= 26.6Kb 27.4Kb 20.2Kb server.example.com => ip.address 2.26Mb 2.66Mb 1.36Mb <= 51.7Kb 49.1Kb 24.4Kb server.example.com => ip.address 586Kb 2.50Mb 1.03Mb <= 4.17Kb 26.1Kb 10.7Kb server.example.com => ip.address 2.42Mb 2.49Mb 2.44Mb <= 31.6Kb 29.7Kb 29.9Kb server.example.com => ip.address 2.41Mb 2.46Mb 2.41Mb <= 26.4Kb 24.5Kb 23.8Kb server.example.com => ip.address 2.37Mb 2.39Mb 2.40Mb <= 28.9Kb 27.0Kb 28.5Kb server.example.com => ip.address 525Kb 2.20Mb 1.05Mb <= 7.03Kb 26.0Kb 12.8Kb qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq TX: cum: 102GB peak: 1.65Gb rates: 1.46Gb 1.44Gb 1.48Gb RX: 1.31GB 24.3Mb 19.5Mb 18.9Mb 20.0Mb TOTAL: 103GB 1.67Gb 1.48Gb 1.46Gb 1.50Gb I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.2 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.2, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.1 port 38895 connected with 0.0.0.2 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes ifconfig server A eth0 Link encap:Ethernet HWaddr 00:25:90:ED:9E:AA inet addr:0.0.0.1 Bcast:0.0.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1202795665 errors:0 dropped:64334 overruns:0 frame:0 TX packets:2313161968 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:893413096188 (832.0 GiB) TX bytes:3360949570454 (3.0 TiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2207544 errors:0 dropped:0 overruns:0 frame:0 TX packets:2207544 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:247769175 (236.2 MiB) TX bytes:247769175 (236.2 MiB) ifconfig Server B eth2 Link encap:Ethernet HWaddr 00:25:90:82:C4:FE inet addr:0.0.0.2 Bcast:0.0.0.2 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:39973046980 errors:0 dropped:1828387600 overruns:0 frame:0 TX packets:69618752480 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3013976063688 (2.7 TiB) TX bytes:102250230803933 (92.9 TiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:1049495 errors:0 dropped:0 overruns:0 frame:0 TX packets:1049495 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:129012422 (123.0 MiB) TX bytes:129012422 (123.0 MiB) Netstat -i on Server B # netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth2 9000 0 42098629968 0 2131223717 0 73698797854 0 0 0 BMRU lo 65536 0 1077908 0 0 0 1077908 0 0 0 LRU I Turn up send/receive buffers on the network card to 2048 and problem still persist I increase the MTU for server A and problem still persist and i increase the MTU for server B for better connectivity and transfer speed but it couldn't transfer at all The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service in server B the transfer in server A at full speed, after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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• The best way to make full system dump on Centos [duplicate]

  - by tester3

  This question already has an answer here: Centos 5 Full backup 1 answer I am on Centos 6.5 with a lot of soft and services installed and working. Also I've got a lot of configs which damaged my brain and I dont want to do it again:) So, can anyone please advice the best way to make a full system dump with all data, so I need only to copy-paste them to new system to get my system ready on the other machine. Or something like that? P.S. Data on my hdd is encrypted, and I'd liked and encrypted dump too. Please help:)

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• Getting access to physical drives in ESXi v5.5 installation on Dell PowerEdge R710 with PERC 6/i

  - by Big-Blue

  I've acquired a Dell PowerEdge R710 server a few days ago, which includes a PERC 6/i RAID controller. The server is now fitted with a SATA SSD, one SAS drive and four SATA HDD's, all of which I would like to be passed through to ESXi in an "as-is" state, without creating any logical drives in the RAID controller. Now, the ESXi v5.5 installation image I grabbed from the Dell homepage starts just fine but only lists the logical drives and connected flash drives as possible installation targets, not any of the physical drives. If I create a small logical drive on my SSD (which the PERC 6/i detects as SATA-SSD type), the ESXi install wizard lists the SSD value on that drive as false; which is far from optimal. I have also tried disabling the RAID controller entirely in the setup, but that also did not help. Everything that should enable passthrough is enabled in BIOS, but that shouldn't be a concern at this early stage of the ESXi installation. How would I be able to install ESXi v5.5 to a part of my SSD that is connected to the storage controller, while giving it entire physical access to the disk (to allow for SMART values to be read etc.)?

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• Changed file and now I cannot access my SSH anymore

  - by Arnold

  I was trying to get my dedicated server to have a couple of VPS's installed using this tutorial: http://linux-vserver.org/Installation_on_CentOS In the process I had to change a file: /etc/ssh/sshd_config The documentation advises to change it into: ListenAddress <host IP address> Guess what? I literally added <host IP address> instead of the dedicated servers IP. I restarted the server and now I'm not able to access my SSH anymore. Can anyone help me to gain access to my SSH again? I'm using CentOS 6.

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• Enabling `mod_rewrite` apache, permissions issues

  - by rudolph9

  In attempting to enable mod_rewrite on the Apache2 web server installed with Mac OSX 10.7.4. Following these instruction, ultimately using the configuration to host CakePHP applications, I run into permissions issues accessing the site via a web browser when I set the directory block associated with cakephp site /etc/apache2/users/username.conf from: <Directory "/Users/username/Sites/"> Options Indexes FollowSymLinks MultiViews AllowOverride none Order allow,deny Allow from all </Directory> /etc/apache2/users/username.conf to: <Directory "/Users/username/Sites/"> Options Indexes MultiViews AllowOverride none Order allow,deny Allow from all </Directory> <Directory "/Users/username/Sites/cakephp_app/"> Options Indexes FollowSymLinks MultiViews AllowOverride all Order allow,deny Allow from all </Directory> The .htaccess files are the CakePHP 2.2.2 default as follows: /Users/username/Sites/cakephp_app/.htaccess <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^$ app/webroot/ [L] RewriteRule (.*) app/webroot/$1 [L] </IfModule> /Users/username/Sites/cakephp_app/app/.htaccess <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^$ webroot/ [L] RewriteRule (.*) webroot/$1 [L] </IfModule> /Users/username/Sites/cakephp_app/app/webroot/.htaccess <IfModule mod_rewrite.c> RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php [QSA,L] </IfModule> When performing the request via a web browser at to http://0.0.0.0/~username/cakephp_app/index.php the content of the response is Not Found The requested URL /Users/username/Sites/cakephp_app/app/webroot/ was not found on this server. Apache/2.2.21 (Unix) DAV/2 PHP/5.3.10 with Suhosin-Patch Server at 0.0.0.0 Port 80 Upon a request to http://0.0.0.0/~username/ and http://0.0.0.0/~username/cakephp_app/, added to /var/log/apache2/error_log accordingly are the following: [Tue Sep 04 22:53:26 2012] [error] [client 127.0.0.1] File does not exist: /Library/WebServer/Documents/Users, referer: http://0.0.0.0/~username/ [Tue Sep 04 22:53:26 2012] [error] [client 127.0.0.1] File does not exist: /Library/WebServer/Documents/favicon.ico What is causing the issue? Is there server program, ideally available via a homebrew script, which would make hosting CakePHP applications for testing purposes more effective and efficient?

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• SQL Server 2008 R2 Replication log reader could not execute sp_replcmds

  - by user49352

  This log reader agent worked perfectly for several months until the user referenced in the error was removed from the domain. After that time the error 'The process could not execute 'sp_replcmds' on 'SERVER'' was received with more detail 'Could not obtain information about Windows NT group/user' that referenced said user. This user was referenced nowhere in the the log reader agent other than the Publication Access List from which it was subsequenctly removed. The agent would still not successfully start up. The simple problem here, I believe, is that the log reader agent was created under that user and that no longer exists in the domain. Is there an 'owner' somewhere that needs to be changed? Every other function on the database continues to execute successfully. Any other help or thought would be appreciated.

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• SVN Checkout error on large repositories

  - by Brian Mitchell

  I wonder if anyone can help me. We have recently migrated our Subversion repository from a VisualSVN Server on Windows to a subversion server on CentOS. The migration was succesfull however we are getting the following error message Error REPORT of svn'/svn/MangoRepository/!svn/vcc/default': Could not read chunk size: Error connection was closed by server (http://servername) Now the workaround for this is simply to perform a update on the repo and it will contine where is left off. Im just wondering if anyone was a permanent fix for this as it can be quite frustrating to repeat my self to 60-70 developers.

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• WAMP Installation - Multiple PHP Version Issues

  - by Pete171

  I have installed WAMP because I am attempting to modify an an application which uses Zend Optimizer (I cannot use Z.O. with PHP5.3+, which is why I decided to install WAMP). I downloaded the latest version - Wamp Server 2.1 - which comes bundled with PHP5.3.5. I then downloaded a PHP version that would be compatible with Z.O. - 5.2.9. - and a compatible Apache version, 2.0.63. My problem: PHP scripts run fine, but anything with MySQL does not work. Running the testmysql.php script returns the fatal error: Fatal error: Call to undefined function mysql_connect() in C:\wamp\www\testmysql.php on line 2". I have looked in the PHP INI files inside both PHP versions, and I'm fairly sure the relevant information is there. At least, there are parts inside that mention MySQL! Perhaps somebody could clarify exactly what information should be present? Also, when visiting a page that called phpinfo(), I noticed that the 'Loaded Configuration File' was pointing to C:\wamp\bin\php\php5.3.5\php.ini, even though I have enabled the older PHP version. I've stopped and started Apache, too, and that hasn't made a difference. Is anybody able to offer any assistance? Anything at all would be great; I'm not very good at messing around with Apache/

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• Windows Server 2003 VPN and Local network

  - by depo

  I have some problems reaching local network , where VPN Windows 2003 server stands. I have a network, which has a VPN server (LAN ip 10.0.0.201). I created a VPN server on that server with different subnet for VPN users (10.0.5.0). After VPN connection is initiated , i am able to acces only 10.0.0.201, but not other PC, which belongs to that network ( all i need to access 10.0.0.203 and 10.0.0.208). I think i need to add somethink to static route table, or not? C:\Documents and Settings\Administratorroute PRINT IPv4 Route Table Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.0.0.254 10.0.0.201 10 10.0.0.0 255.0.0.0 10.0.0.201 10.0.0.201 10 10.0.0.201 255.255.255.255 127.0.0.1 127.0.0.1 10 10.0.5.1 255.255.255.255 127.0.0.1 127.0.0.1 50 10.255.255.255 255.255.255.255 10.0.0.201 10.0.0.201 10 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 224.0.0.0 240.0.0.0 10.0.0.201 10.0.0.201 10 255.255.255.255 255.255.255.255 10.0.0.201 10.0.0.201 1 Default Gateway: 10.0.0.254 Persistent Routes: None C:\Documents and Settings\Administratoripconfig /all PPP adapter RAS Server (Dial In) Interface: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface Physical Address. . . . . . . . . : 00-53-45-00-00-00 DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 10.0.5.1 Subnet Mask . . . . . . . . . . . : 255.255.255.255 Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection 2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection Physical Address. . . . . . . . . : 00-0E-0C-3D-C9-51 DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 10.0.0.201 Subnet Mask . . . . . . . . . . . : 255.0.0.0 Default Gateway . . . . . . . . . : 10.0.0.254 DNS Servers . . . . . . . . . . . : 127.0.0.1 Primary WINS Server . . . . . . . : 10.0.0.201 NetBIOS over Tcpip. . . . . . . . : Disabled VPN Client PPP adapter VPN Connection 2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : VPN Connection 2 Physical Address. . . . . . . . . : DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 10.0.5.4(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.255 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 10.0.0.201 Primary WINS Server . . . . . . . : 10.0.0.201 NetBIOS over Tcpip. . . . . . . . : Enabled

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• Is adding users to the group www-data safe on Debian?

  - by John

  Many PHP applications do self-configuration and self-updating. This requires apache to have write access to the PHP files. While chgrp'ing them all to www-data appears like a good practice to avoid making them world writable, I also wish to allow users to create new files and edit existing one. Is adding users to the group www-data safe on Debian? For example: 775 root www-data /var/www 644 john www-data /var/www/johns_php_application.php 660 john www-data /var/www/johns_php_applications_configuration_file

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• Motion - takes snapshot without motion detected

  - by Emmanuel Brunet

  I've been installed the standard motion 3.2.12 package on debian 7.5. I would like to get snapshot ONLY when motion is detected, but it still saves a picture every second without any activity in front of the camera. I'm using a TENVIS JPT3815W IP camera motion.conf here is my configuration file setup_mode off target_dir /media/videos/log/webcam netcam_url http://webcam/snapshot.cgi netcam_tolerant_check on netcam_userpass admin:alpha1237 # Output frames at 1 fps when no motion is detected and increase to the # rate given by webcam_maxrate when motion is detected (default: off) webcam_motion off output_all off # detection settings 1-255 default 32 noise_level 50 # Maximum framerate for webcam streams (default: 1) webcam_maxrate 25 pre_capture 0 framerate 25 gap 30 locate on mail [email protected] text_right "FRONT CAMERA %Y/%m/%d - %T" text_double on ffmpeg_cap_new on ffmpeg_cap_motion on ffmpeg_video_codec mpeg4 output_motion off snapshot_interval 0 # Quality of the jpeg (in percent) images produced (default: 50) quality 90 # Restrict webcam connections to localhost only (default: on) webcam_localhost off # Limits the number of images per connection (default: 0 = unlimited) # Number can be defined by multiplying actual webcam rate by desired number of seconds # Actual webcam rate is the smallest of the numbers framerate and webcam_maxrate webcam_limit 0 Issue when I start motion images are stored in /media/videos/log/webcam nearly every second. I hjust want to get images when a motion is detected and the according video clip Any idea where the configuration fails ?

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• How to capture footage from an analog TV?

  - by hope

  I have only an old analog TV with just RCA connectors and a coaxial/cable in/out wire. It uses no HDMI interface, etc. I would like to know the cheapest method possible where the current video footage can be transferred and made into a target digital video file format and be copyable/transferrable via USB. Are there any devices that can do this with an analog TV? Basically, how can I get something along these lines done and for cheap?P I do NOT want to stream; I want footage recorded off the TV and stored via a digital encoding of a video file.

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• DIG command is hanging and not timing out as expected

  - by igalvez

  I ran into the following issue by accident when playing around with the DIG command and testing some domain names. Why does DIG hang and not timeout after 10 seconds when executing the following: dig +tries=1 +tries=1 +retry=1 +time=5 +trace google.us.com DIG hangs for about 30 seconds instead of timing out and then dies with the following error message: dig: couldn't get address for 'ns.reserved-domain.uk.com': no more Do I need to set another flag/option for DIG to have it timeout instead of hanging, or is this a bug? DIG version: DiG 9.9.5-3-Ubuntu

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• In Process Explorer is it possible change scaling of activity graph the be able to further analyse graph?

  - by therobyouknow

  Is there any way to zoom in, in the System Internals Process Explorer graph? Background I'm trying to work out why my PC freezes/locks up for about a second (the pointer does not move) every so often. This has only been happening for the last 2 days. There is a very narrow spike associated with the freeze, but it's hard to hover over it an analyse what is causing it. My PC spec: ThinkPad X201S 1440x900 i7 2.0GHz 8Gb RAM, 256GB Samsung 840Pro SSD, Windows 8.1 Pro 64bit CalDigit USB 3.0 ExpressCard 34, Ultrabase X200 with DisplayPort to HDMI

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• How to change Content-Transfer-Encoding for email attachments?

  - by user1837811

  I have signed up for http://eudyptula-challenge.org/ challenge and this accepts email attachments only in simple text format. The files without extension (and also .zip file) are transferred with base64 encoding. I want to send email attachment in simple text. This is how my makefile is transferred :- Content-Type: text/plain; charset=UTF-8; name="Makefile" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Makefile" b2JqLW0gKz0gaGVsbG8yLm8KCmFsbDoKCW1ha2UgLUMgL2xpYi9tb2R1bGVzLyQoc2hlbGwg dW5hbWUgLXIpL2J1aWxkIE09JChQV0QpIG1vZHVsZXMKCmNsZWFuOgoJbWFrZSAtQyAvbGli L21vZHVsZXMvJChzaGVsbCB1bmFtZSAtcikvYnVpbGQgTT0kKFBXRCkgY2xlYW4KCg== How to configure Thunderbird to send a attachment files in as simple text?? Or I should any other email server or tool to send email attachments in simple text??

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• Adding add-ins to excel - strange communicates

  - by Jacob

  I am using Excel 2010 and 2013. I would like to add an excel add-in from page http://xlloop.sourceforge.net/ . There is file with name xlloop-0.3.2 and extension Microsoft Excel XLL Add-In. I added this file from menu File - Options - Add-Ins - In combobox Manage i choosed Excel Add-Ins - Go... - Browse and I choosed my file. I see the following comunicate: "C:\...\xlloop-0.3.2.xll" is not a valid add-in. Thus, I do next attempt. I go from menu File - Open - and I choosed my file. I see comunicate: The file you are trying to open "xlloop-0.3.2.xll", is in a difference format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now? After I clicked Yes I see a lot of signs (something like from chinese :)) My last attempt was double clicked on file. I see: The file format and extension of "xlloop-0.3.2.xll" don't match. The file could be corrupted or unsafe. Unless you trust its source , don't open it. Do you want open it anyway? After clicked yes I see something like the second attempt. I am really very confused because some of my friends have the same version of excel and they don't have these communicates. Do you have any idea where is the problem in my excel? I very need this addin to work with Java. I will very grateful for your help! Thanks in advance!

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• yum install gcc fails with invalid linux.dropbox.com/fedora directory

  - by john

  I am relatively new to Linux administration. I have installed Centos 6.5 (under VirtualBox on a Win7pro system). When I try to install gcc to the system using yum, I get the following results: [root@localhost etc]# yum clean all Loaded plugins: fastestmirror, refresh-packagekit, security Cleaning repos: Dropbox base extras updates Cleaning up Everything Cleaning up list of fastest mirrors [root@localhost etc]# yum install gcc Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors * base: mirrors.tummy.com * extras: mirrors.cat.pdx.edu * updates: centos.mirror.freedomvoice.com http://linux.dropbox.com/fedora/6/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again It appears that the linux.dropbox.com/fedora/6 subdirectory does not exist. Does anyone have any ints/answers for me. Thanks.

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• HP Photosmart C5280 black ink not printing properly

  - by Andreas Strandfelt

  I just got a used HP Photosmart C5280 from my father in law. There is a problem with the black ink, though. Sometimes, it doesn't print and when it does, it's not really black. An example can be seen at the following link, where I created three black boxes on a Word page and printed. The outcome is somewhat blueish: Other tests with black text only come out as blank pages. I have tried using the print head cleaning utility from the menu of the printer as well as doing the cleaning myself with alcohol. Nothing has worked. Any ideas before I throw out the black cartridge?

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• Starting programs from terminal then exiting terminal exits started programs?

  - by sherrellbc

  I really was unsure how to phrase the question title. What I mean is that when I use the terminal to start a program, most of the time when the terminal is closed it also exits the programs started from it. Now this makes sense if we look at it from a hierarchical standpoint of the terminal being the parent process which spawns child processes, and any halt of the parent causes subsequent halting of the children as well. However, I've noticed this to not always be the case. For example, I downloaded Sublime Text Editor and created a symlink in PATH. I can start this program by issuing a sublime command from the terminal, but subsequent closure of the terminal program does nothing to sublime. However, other times either the child process that was started it also closed or it hangs up and causes problems. tl;dr: Is it always the case that programs started from a closed parent process will be closed when the parent is exited? And if so, is there way to start a program from the terminal and then close the terminal without exiting the started process? The whole point here is to start programs from the terminal so I do not overly-populate my desktop with symlinks.

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• my HP desktop with Windows Vista wont boot

  - by John

  It continues to loop to a BSOD and I cant get a dos prompt or repair screen, I dont have recovery disks but I have brought up a window, black, with gray title bar that is labeled Edit Boot Options, below that it has Edit Windows boot options for: Windows Vista (TM) Home Premium Path: \WINDOWS\system32\winload.exe Partition:1 Hard Disk: 1549f232 and then it has a place to enter something starting with one of these [ and one or two lines down it has ] what do i enter in this space and is there something i can enter that would help solve my boot up issues

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• How to extract 4th line from 300 text files?

  - by Twoopah

  I have about 300 emails (gmail) that go like this: Dear [name] Order ID:123456789 Purchased by: [name I need] (blah blah another 26 lines of crap (total of 30 lines)) What I need help is how to save gmail's mails locally into .txt and how to export 4th line from each text file. I can easily run Replace 'Purchased by: ' to remove that and keep only the names from that line in a list, but other than that I have no clue Any ideas?

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• Windows 8.1 Search does not automatically select first search match

  - by Miguel Sevilla

  When I search in Windows 8/8.1 (start menu-start typing), it doesn't automatically highlight the search term. For example, if I'm trying to open the "Internet Options" panel and type the entire thing out in search, I have to down arrow or tab to the "Internet Options" search result. This is retarded. I'm used to Windows 7 style search where the first match is highlighted and i can easily just hit return. First match highlighting does work for other built-in things like "Control Panel", but it should work for all things in general, as it did in Windows 7 search. Anyways, if there is an option to enable this in Windows 8/8.1, I'd appreciate the tip. Thanks!

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• Connect USB hard drive to wireless router on RJ45 port? Possible?

  - by lawphotog

  just a quick story behind. I was trying to set up wireless networked hard drive at home. My wireless router doesn't take USB. I am considering few options. First i was considering to get something like WD My Cloud. My router is an old one provided by service provider. It only has 10/100 Ethernet. WD My Cloud has Gigabit interface. So unless i changed a new router, data transfer will be slow. So upgrading the router is a must if i want fast transfer speed. Plus I already own an external hard drive with USB 3.0 interface. So if I get a router like Netgear D6300, i can get a decent speed wireless shared drive at home. And i can use my existing HDD instead of WD My Cloud. But the router isn't cheap so I am saving up for that. In the meantime I found out the existence of USB to RJ45 adaptor. I read the reviews and some say it works for them and for some don't. They didn't really say what they were trying to do so I'm confused. So if i bought an adaptor like this, can i connect my existing HDD (USB) with my existing router (RJ45) and use it as a shared drive for data transfer? I know it will be slow as the adaptor will only have USB 2.0 and 10/100 for Ethernet. But it's fine as it's for temporary until i got my new router.

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• ACHI drivers for W8.1 with amd

  - by LeiNaD_87

  I hope you can help me... I just installed a SSD (Samsung EVO 840) and windows 8.1 pro in my pc with M5A99X EVO ( chipset AMD 990X/SB950 ) motherboard. The SSD is installed in sata3 socket using a sata3 wire. The AHCI mode is ON in the bios. I configured the ahci controller and now device administrator looks like this: All works, but the speed of the SDD is very slow (like a HDD). Samsung magician doesn't recognize the sata mode neither the ahci. I tried to install more drivers but the system broke and I need to reinstall windows :( I tried many things from the web, but any works: Modify windows registy Use compatibility mode Modify the amd drivers and install it unsigned Thank you for your time!! EDIT to add a CrystalDiskMark benchmark

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• Can I fork a copy command on ReadyNAS SSH?

  - by DanyW

  I have a ReadyNAS 102 with a couple of USB drives attached. There were times I wanted to copy files between volumes. Unfortunately I have also accidentally cut off copying process by accidentally closing off the SSH sessions. Is it possible for me to fork a cp or mv process on SSH? As it currently stands when I close the SSH session, be it by accidentally closing the terminal window or closing my laptop screen and putting it to sleep, the copy process stops. Can I do something like cp ~/blah /some/other/path & and have the process keep running to completion in the background even if the SSH session is terminated?

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