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Articles indexed in November 2013

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• DNS SERVFAIL and NXDOMAIN on specific hostname

  - by David George

  I have two DNS servers in my domain, Windows 2003 and Windows 2008, but recently both are failing to route users to www.cdw.com. I have had no other complaints with any other websites, but when trying to use cdw.com the page never loads. I tried to resolve the hostname and get the NXDOMAIN error below: MyComputer:~ me$ nslookup cdw.com ;; Got SERVFAIL reply from 192.168.2.1, trying next server Server: 192.168.2.2 Address: 192.168.2.2#53 ** server can't find cdw.com: NXDOMAIN MyComputer:~ me$ nslookup serverfault.com Server: 192.168.2.2 Address: 192.168.2.2#53 Non-authoritative answer: Name: serverfault.com Address: 198.252.206.16

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• Squid external_acl_type Cannot run process

  - by Alex Rezistorman

  I want to restrict uploading for group of the users via squid. So I've choosen to use external_acl_type but after reload of the squid it returns error. WARNING: Cannot run '/usr/local/etc/squid/lists/newupload.sh' process. Permissions of newupload.sh and squid are the same. newupload.sh is executive. How can I solve this problem? Thnx in advance. newupload.sh #!/bin/sh while read line; do set -- $line length=$1 limit=$2 if [ -z "$length" ] || [ "$length" -le "$2" ]; then echo OK else echo ERR fi done Strings from squid.conf external_acl_type request_body protocol=2.5 %{Content-Lenght} /usr/local/etc/squid/lists/newupload.sh acl request_max_size external request_body 5000 http_access allow users request_max_size Squid version squid -v Squid Cache: Version 3.2.13 configure options: '--with-default-user=squid' '--bindir=/usr/local/sbin' '--sbindir=/usr/local/sbin' '--datadir=/usr/local/etc/squid' '--libexecdir=/usr/local/libexec/squid' '--localstatedir=/var' '--sysconfdir=/usr/local/etc/squid' '--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid/squid.pid' '--with-swapdir=/var/squid/cache/squid' '--enable-auth' '--enable-build-info' '--enable-loadable-modules' '--enable-removal-policies=lru heap' '--disable-epoll' '--disable-linux-netfilter' '--disable-linux-tproxy' '--disable-translation' '--enable-auth-basic=PAM' '--disable-auth-digest' '--enable-external-acl-helpers= kerberos_ldap_group' '--enable-auth-negotiate=kerberos' '--disable-auth-ntlm' '--without-pthreads' '--enable-storeio=diskd ufs' '--enable-disk-io=AIO Blocking DiskDaemon IpcIo Mmapped' '--enable-log-daemon-helpers=file' '--disable-url-rewrite-helpers' '--disable-ipv6' '--disable-snmp' '--disable-htcp' '--disable-forw-via-db' '--disable-cache-digests' '--disable-wccp' '--disable-wccpv2' '--disable-ident-lookups' '--disable-eui' '--disable-ipfw-transparent' '--disable-pf-transparent' '--disable-ipf-transparent' '--disable-follow-x-forwarded-for' '--disable-ecap' '--disable-icap-client' '--disable-esi' '--enable-kqueue' '--with-large-files' '--enable-cachemgr-hostname=proxy.adir.vbr.ua' '--with-filedescriptors=131072' '--disable-auto-locale' '--prefix=/usr/local' '--mandir=/usr/local/man' '--infodir=/usr/local/info/' '--build=amd64-portbld-freebsd8.3' 'build_alias=amd64-portbld-freebsd8.3' 'CC=cc' 'CFLAGS=-O2 -fno-strict-aliasing -frename-registers -fweb -fforce-addr -fmerge-all-constants -maccumulate-outgoing-args -pipe -march=core2 -I/usr/local/include -DLDAP_DEPRECATED' 'LDFLAGS= -L/usr/local/lib' 'CPPFLAGS=-I/usr/local/include' 'CXX=c++' 'CXXFLAGS=-O2 -fno-strict-aliasing -frename-registers -fweb -fforce-addr -fmerge-all-constants -maccumulate-outgoing-args -pipe -march=core2 -I/usr/local/include -DLDAP_DEPRECATED' 'CPP=cpp' --enable-ltdl-convenience Related post: Restrict uploading for groups in squid http://squid-web-proxy-cache.1019090.n4.nabble.com/flexible-managing-of-request-body-max-size-with-squid-2-5-STABLE12-td1022653.html

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• Mailman aggregate mailing lists

  - by s1nny

  Using CENTOS 5.10, WHM, CpanelX I'm setting up mailing lists for my company (microsoft exchange costs too much for the number of users we have). So I've got a few mailing lists set up right now @Naples, @Cayman, @ACK, @Managers etc which are all set up and working nicely. Now I need to create an aggregate list, @Stores, which sends to other lists, in this case @Naples, @Cayman and @ACK and leaving out @Managers. I keep getting authorization requests from each store list when I send to @Stores but if I send to each store list individually its fine. I've got them all set up to "accept non member postings for which no explicit action is defined", as well as set "accept_these_nonmembers" to ^.*

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• When one DC crashes, TFS 2012 stops working

  - by blizz

  We have two Windows 2008 domain controllers. We installed the second DC only a few months ago. We also have a TFS 2012 server on the network. Today, when the older DC crashed, TFS stopped working completely. Local users received messages such as "You are not authorized to access ServerName\Collection". Remote users received messages such as "The server was used in your last session, but it might be offline or unreachable". So my question is, why did TFS not use the second, newer DC instead of just crashing along with the first DC?

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• php_ibm_db2.dll on IIS 7.5 using PHP 5.3 error message

  - by grmbl

  I'm trying to use ibm_db2 extension to access iSeries DB2 database. This is the testcode (taken from here) <?php $database = 'ALI452BFAL'; //library $user = 'STN452'; $password = '**********'; $hostname = 'myserverip'; $port = 50000; $conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;" . "HOSTNAME=$hostname;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;"; $conn = db2_connect($conn_string, '', ''); if ($conn) { print "ok"; db2_close($conn); } else { echo db2_conn_error() . '<br>' . db2_conn_errormsg(); } ?> I have installed a very basic package containing the db2 driver and added this as an extension. (IBM Data Server Driver for ODBC, CLI, and .NET.msi) This is my result: 08001 [IBM][CLI Driver] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". Location where the error was detected: "10.10.0.120". Communication function detecting the error: "connect". Protocol specific error code(s): "10061", "", "". SQLSTATE=08001 SQLCODE=-30081 Anybody tried this before??

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• Online FTP or file sharing service [on hold]

  - by Frede

  We need to share large files with clients, e.g. clients upload a large file, we modify it and later make it available for download. Up until now we've used FTP but this has a number of drawbacks. A lot of management of files and setting up accounts etc. We are therefore considering online alternatives. Requirements: Cheap, 8-) Easy to use, ideally just requiring a web browser, but also possible for power users to connect e.g. via FTPS/SFTP No registration requried for users to upload/download files. We ourselves of course need to be able to login an view uploaded files and upload new files. No per user fee High bandwidth. As files may be GBs in size both upload and download speed cannot be too slow Secure. Encryption during upload/download. No way for users to access uploaded files. Once a user has uploaded a file they (or anyone else besides us) should be able to access the file. To download files users get a link with a password. Ideally the link expires after a set time. No software installation We do NOT need any sync features, backup, versioning etc. Just a quick, easy, secure way for us to share files with our clients. Services like JustCloud, DriveHQ etc seems bloated and "too much" for what we need. What other alternatives exist? Thanks!

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• BIND9 DNS Records not Propagating

  - by natediggs

  Kind of new to managing DNS via BIND. We have a setup with a master server and a slave server. I've updated the zone file on the primary name server for our domain but the changes aren't propagating over to the secondary server. The funny thing is that I'm making a change in the zone file for a different domain on the server and those changes ARE being propagated to the secondary server. Anyway I can force the change to be made? Also, there was a third nameserver that used to be operational but has been offline for a few months now. I removed it from the zone file for the two domains that have it listed as a name server and it still (over 24 hours later) shows up from time to time when I run a record check. Any help on this would be greatly appreciated. Nate

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• Getting AWStats to work in Ubuntu 12.04

  - by koogee

  I'm new to apache and i'm trying to set up AWStats on my ubuntu 12.04 server. I've followed the guide at Ubuntu docs https://help.ubuntu.com/community/AWStats I set it up according to the instructions and awstats is able to generate initial stats from apache log successfully. I placed the links to awstats in the default virtual host file. However when I try to run http://server-ip-address:8080/awstats/awstats.pl, I get: Error: SiteDomain parameter not defined in your config/domain file. You must edit it for using this version of AWStats. Setup ('/etc/awstats/awstats.conf' file, web server or permissions) may be wrong. Check config file, permissions and AWStats documentation (in 'docs' directory). Here is my /etc/apache2/sites-available/default file: <VirtualHost *:8080> ServerAdmin webmaster@localhost DocumentRoot /home/saad/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /home/saad/www/> Options Indexes FollowSymLinks MultiViews AllowOverride AuthConfig Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> Alias /awstatsclasses "/usr/share/awstats/lib/" Alias /awstats-icon "/usr/share/awstats/icon/" Alias /awstatscss "/usr/share/doc/awstats/examples/css" ScriptAlias /awstats/ /usr/lib/cgi-bin/ Options ExecCGI -MultiViews +SymLinksIfOwnerMatch ErrorLog ${APACHE_LOG_DIR}/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog ${APACHE_LOG_DIR}/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> The only three variables I edited in /etc/awstats/awstats.conf are: LogFile="/var/log/apache2/access.log" SiteDomain="server-name.noip.org" HostAliases="localhost 127.0.0.1 server-name.no-ip.org" The apache server works fine and i'm able to access other pages stored on the server. Any guidance would be welcome.

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• puppet service not stopping service

  - by Gregg Leventhal

  notice ("This should be echoed") service { "iptables": ensure => "stopped", } This does not stop iptables, I am not sure why. service iptables stop works fine. Puppet 2.6.17 on CentOS 6.3. UPDATE: /etc/puppet/manifests/nodes.pp node 'linux-dev' { include mycompany::install::apache::init include mycompany::config::services::init } /etc/puppet/modules/mycompany/manifests/config/services/init.pp class mycompany::config::services::init { if ($::id == "root") { service { 'iptables': #name => '/sbin/iptables', #enable => false, #hasstatus => true, ensure => stopped } notice ("IPTABLES is now being stopped...") file { '/tmp/puppet_still_works': ensure => 'present', owner => root } else { err("Error: this manifest must be run as the root user!") } }

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• Unable to start Tomcat6 with HTTPS enabled

  - by ram

  I have the following server.xml settings for my tomcat6 server <!-- COMMENTED <Connector port="8080" maxThreads="150" enableLookups="false" acceptCount="100" scheme="http" redirectPort="8443"/> --> <!-- COMMENTED <Connector port="80" maxThreads="150" enableLookups="false" acceptCount="100" scheme="http" redirectPort="443"/> --> <Connector port="443" maxHttpHeaderSize="8192" maxThreads="150" enableLookups="false" disableUploadTimeout="true" acceptCount="100" scheme="https" secure="true" SSLEnabled="true" SSLCertificateFile="%SSL_CERT%" SSLCertificateKeyFile="%SSL_KEY%" SSLCipherSuite="ALL:!ADH:!kEDH:!SSLv2:!EXPORT40:!EXP:!LOW" compression="on" compressableMimeType="text/html,text/xml,text/plain,application/javascript,application/json,text/javascript"/> Complete server.xml is here but when I try to start the application I get the following error in catalina.*.log file INFO: Initializing Coyote HTTP/1.1 on http-80 Apr 7, 2013 8:38:38 PM org.apache.coyote.http11.Http11AprProtocol init SEVERE: Error initializing endpoint java.lang.Exception: Invalid Server SSL Protocol (error:00000000:lib(0):func(0):reason(0)) at org.apache.tomcat.jni.SSLContext.make(Native Method) at org.apache.tomcat.util.net.AprEndpoint.init(AprEndpoint.java:729) at org.apache.coyote.http11.Http11AprProtocol.init(Http11AprProtocol.java:107) at org.apache.catalina.connector.Connector.initialize(Connector.java:1049) at org.apache.catalina.core.StandardService.initialize(StandardService.java:703) at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:838) at org.apache.catalina.startup.Catalina.load(Catalina.java:538) at org.apache.catalina.startup.Catalina.load(Catalina.java:562) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Apr 7, 2013 8:38:38 PM org.apache.catalina.core.StandardService initialize SEVERE: Failed to initialize connector [Connector[HTTP/1.1-443]] LifecycleException: Protocol handler initialization failed: java.lang.Exception: Invalid Server SSL Protocol (error:00000000:lib(0):func(0):reason(0)) at org.apache.catalina.connector.Connector.initialize(Connector.java:1051) at org.apache.catalina.core.StandardService.initialize(StandardService.java:703) at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:838) at org.apache.catalina.startup.Catalina.load(Catalina.java:538) at org.apache.catalina.startup.Catalina.load(Catalina.java:562) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) I've checked the following things already I have given read permissions for everyone for .crt and .key files I copied server.xml to a different working tomcat6 server and it works there, server.xml from the mentioned working tomcat5 webserver doesn't work here and it fails with the same error Works well with just HTTP enabled explicitly mentioning protocol in the Connector i.e. protocol="org.apache.coyote.http11.Http11AprProtocol" results in the same exception Please help me if I am missing something. Thanks in advance

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• Issues connecting to HP ProCurve switches

  - by BriGuy

  We are having a very strange issue trying to connect to our infrastructure switches via SSH. When you first try connecting to them, the switches will prompt for the password - and then just sit there after it is entered. If you create a second SSH session to the switch (while letting the first one remain open and just sitting there) it will let you log right in. The switches are doing the same thing with RADIUS and local authentication. The other strange part to all of this, is that about 10 switches started doing it all at the same time. As far as actual configuration of the switches, nothing has changed. Occasionally, one switch will start working like normal, but then stop again. These are all HP ProCurve managed switches, but all different models/firmware. Some switches that are not working are using the same firmware as others that are working. UPDATE: 20130312 I am also seeing this same behavior when trying to use telnet. The first telnet session just hangs there, and the second telnet session will let me log in. Rebooting the switches seems to get them working, but I still have 5 production switches that cannot easily be rebooted because of their production roles. Is anyone aware of anything else that can be switched on/off that may reset the logon for remote management or something like that?

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• I am getting a 400 Bad Request error when using Nginx and PHP-FPM, why?

  - by Bob

  I am trying to run a website (that requires PHP - it technically doesn't require MySQL at this time, but it may sometime in the near future as I continue developing it, so I went ahead and installed that as well) using nginx 1.2.4 and PHP-FPM 5.3.3 on Ubuntu 12.04.1 LTS. As far as I know, I haven't done anything wrong, but clearly something is not quite right - I seem to be getting a 400 Bad Request error whenever I try to browse to my website. I've been mostly following one guide, and I've done more or less everything it recommends, except for not setting up PHP-FPM to use a Unix Socket and I used service as opposed to /etc/init.d/ when starting/stopping nginx, PHP, and MySQL. Anyways, here are my relevant configuration files (I have only censored personal/sensitive details, like my domain name - which contains my real name): /etc/nginx/nginx.conf user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; } http { ## # Basic Settings ## sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 15; types_hash_max_size 2048; # server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "msie6"; # gzip_vary on; # gzip_proxied any; # gzip_comp_level 6; # gzip_buffers 16 8k; # gzip_http_version 1.1; # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; ## # nginx-naxsi config ## # Uncomment it if you installed nginx-naxsi ## #include /etc/nginx/naxsi_core.rules; ## # nginx-passenger config ## # Uncomment it if you installed nginx-passenger ## #passenger_root /usr; #passenger_ruby /usr/bin/ruby; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } /etc/nginx/sites-enabled/subdomain.mydomain.net server { listen 80; # listen for IPv4 listen [::]:80; # listen for IPv6 server_name www.subdomain.mydomain.net subdomain.mydomain.net; access_log /srv/www/subdomain.mydomain.net/logs/access.log; error_log /srv/www/subdomain.mydomain.net/logs/error.log; location / { root /srv/www/subdomain.mydomain.net/public; index index.php; } location ~ \.php$ { try_files $uri =400; include fastcgi_params; fastcgi_split_path_info ^(.+\.php)(/.+)$; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /srv/www/subdomain.mydomain.net/public$fastcgi_script_name; } } All the directories listed in the configuration files above are correct on my server (to the extent of my knowledge). I have not included /etc/php5/fpm/pool.d/www.conf or /etc/php5/fpm/php.ini in this post as they're rather long, but I have posted them on Pastebin: http://pastebin.com/ensErJD8 and http://pastebin.com/T23dt7vM, respectively. Although, the only thing I've changed in either of the two files was in php.ini, where I set expose_php to off so as to hide the .php file extension from users. What can I do to resolve my issue? Please let me know if I need to supply any additional details.

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• Dovecot ignoring maximum number of IMAP connections

  - by Michelle

  I have a single mailbox mail server running Dovecot/Postfix and I have two IMAP clients, Thunderbird on the PC and K9 on Android. I keep on receiving this error in my logs even after I change the 'mail_max_userip_connections' variable to 50. puppet dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=<[email protected]>, method=PLAIN, rip=62.242.90.2, lip=198.29.31.229, TLS Why does it say that it is set to 10 in the log? Is that hardcoded? grep -r "mail_max_userip_connections" /etc/dovecot /etc/dovecot/conf.d/20-managesieve.conf: #mail_max_userip_connections = 10 /etc/dovecot/conf.d/20-pop3.conf: #mail_max_userip_connections = 3 /etc/dovecot/conf.d/20-imap.conf: mail_max_userip_connections = 50 I've restarted dovecot after making the changes but this error is still logged and I can't access the mailbox. Can anyone help me understand why I can't seem to raise the maximum limit?

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• Debian Testing installs Iceweasel ESR (severely outdated)?

  - by Lucas Phillips

  I just reinstalled Debian Testing, and for some reason, instead of Iceweasel 25, I have 17. The installed and candidate versions are both 17.0.9esr-1~deb7u1. apt-get update && apt-get upgrade does nothing, and it seems that version 17 is the latest for this install. I was on Debian Testing before, and Iceweasel was at the latest version. Even Debian Stable had an Iceweasel version 20. Why would it be trying to install ESR now?

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• Redhat Linux password fail on ssh

  - by Stephopolis

  I am trying to ssh into my linux machine from my mac. If I am physically at the machine I can log in with my password just fine, but if I am sshing it refuses. I am getting: Permission denies (publickey,keyboard-interactive) I thought that it might be caused by some changes that I recently made to system-auth, but I restored everything to what I believe was the original format: #%PAM-1.0 # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. auth required pam_env.so auth sufficient pam_fprintd.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so account required pam_unix.so account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 500 quiet account required pam_permit.so password requisite pam_cracklib.so try_first_pass retry=3 password sufficient pam_unix.so md5 shadow nullok try_first_pass use_authtok password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so But I still could not ssh in. I tried removing my password all together and that didn't seem to help either. It still asks and even entering an empty string (nothing) it still fails me out. Any advice?

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• Weird internet connection behavior

  - by ShadowBroker

  I'm having a strange problem with my internet connection. At the moment my ISP is Fastweb (an italian provider) and i noticed that sometimes i can't load some sites, then all i have to do is wait 5 minutes and then i can load the site again. Some other times, instead, images won't load on certains sites (this always happens with 500px.com or Facebook rarely). I noticed that if i use VPN software like Privitize VPN or Spotflux everything works like a charm. Is something wrong with my internet configuration? Thank you.

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• Redirect 'host-based' requests to a port (inside a docker container)

  - by Disco

  I'm trying to achieve this fun project of having multiple 'postfix/dovecot' instances inside a docker container. I'm searching for 'something' that would redirect any incoming request on port 25 (any maybe later 143, 993) to the right container on a different port. Here's the idea : +-------+ +----------+ (internet)----(port 25) |mainbox| ---- (port 52032) |container1| (postfix) +-------+ | +----------+ \ (port 52033) +----------+ |container2| (postfix) +----------+ So the idea is to 'redirect' requests coming to port 25 and based on 'hostname' to forward to the right port (internally); ideally, it would be great to manage this 'mapping' with a database/textfile Any ideas ? Directions ?

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• linux - Is Debian "lighter" than Ubuntu?

  - by user2983756

  I currently run Linux Mint 14 KDE on a "semi-old" machine I use for working and surfing the web - it was the first Linux system I ever used (running away from old Win XP), so I picked a complete system that would have most of my basic needs installed (I didn't even know what exactly all those needs were at the time). The thing is, my computer is becoming really old and Mint is a cluttered system, and for the next installation I'm going to try and install a "raw" system and get everything from the online repos. My question is: Since Ubuntu is Debian-based, does that make it consume more resources than its base system? If that isn't the difference, which one is "lighter" in that sense?

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• Determining the required depth and specifications for a server cabinet

  - by Bingu Bingme

  I'm trying to understand the considerations ("why") that go into determining the specifications ("what") for a rackmount server cabinet, in order to determine what sort of rack I should purchase for my home use. Since this is for home use, I won't be following certain best practices (eg. hot/cold aisle, not even air conditioning) and may be willing to sacrifice in various areas in order to reduce cost and footprint - but please advise if there are safety concerns or other considerations to note. The most basic specs for a server cabinet are the dimensions (external width x external depth x usable height). Width: commonly 600mm or 800mm (if the use case requires extra clearance around the sides, such as if there is lots of cabling). In my case and most common cases, I'm going to stick with 600mm. Height: Select a sufficiently tall rack to fit my equipment. But how much may I stuff into it? Eg, if there is a 15U rack, can I really populate it with 15U of servers, or should I leave 1U at top and bottom for air circulation? Depth: Racks commonly have external depth of 600mm (network equipment), 800mm, 1000mm, or even longer. I'm trying to see how to fit into the 800mm depth. With reference to http://www.server-racks.com/rack-mount-depth.html, I'm hoping to have the front and rear posts mounted ~ 28.5" (72cm) apart, which would leave only 8cm for front space and rear space. How much rear space (from rear posts to back of rack) do I really need? I won't use cable management arms, so can I mount a 72cm depth server since the power, KVM, network cables won't take up much depth? My most important equipment are all < 60cm depth (4U chassis) and should comfortably fit within the 800mm cabinet. The rest of the equipment are very old 1U servers that range from 65-72cm depth. I might still want to make further use of them, or I might discard them since they are so old. Even if the 72cm servers cannot be powered on in an 800mm rack, I should be able to use them as 1U shelves. But, what server depth can I expect to be able to operate? Or am I forced to upgrade to 1000mm depth racks in order to use any servers deeper than 60cm? With reference to best practices for HP racks, some other specs and installation considerations: There aren't any minimum recommendations for clearance on the sides of the rack. It is recommended to leave 48" front clearance. The 48" front clearance is based on 32" chassis depth, 13" to extend the rack rails and mate the inner/outer rails, and 3" for movement. If I don't use such rails (eg, use shelves instead), it should be sufficient to leave front clearance of chassis depth + 3". It is recommended to leave 30" rear clearance "to provide space for servicing the rack". I'm planning to back the rack into a corner of the room, and wheel it slightly out when I need to access the rear. If the wheeling plan is ok, I still need to know how much rear clearance is required for air circulation and ventilation purposes. Castor wheels and stabilising feet. Since I'm backing the rack into a corner of the room, I'll only be able to set the stabilising feet on the front corners. Thoughts on safety? The rack that I'm considering has front glass doors with side ventilation slits and fully perforated rear doors. I'm hoping this will be a good balance between temperature and noise (only ventilation slits facing out the front, while the rear is facing the walls). Or is the sound of high-rpm fans going to escape through the front slits anyway and destroy my sanity?

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• Speeding up ping

  - by sam

  We have pretty slow internet which makes working online quite tedious some times the internet is just generally slow, 600ms ping, 0.90mb download. (we are in Londnon, can you beleive). But other times the internet download speed is ok 5-8mb but the ping in 600ms is there a way we can speed this up. Good performance would be 5-10mb 30ms ping at our location, which we sometimes get in the morning. Resetting the router always seem to solve the ping issue for about 10 minutes but then it slows down again, any idea whats governing the ping and if anything can be done to address it ?

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• How to reference individual cells in Excel to variable data from records in an external SQL table

  - by user273476

  I have a SQL table containing date oriented financial data eg. multiple daily records with fields for Date, Account code and Value. I want to set up dynamic links (formulas) from cells in an Excel speadsheet to this data so when the spreadsheet is loaded the data is fetched from all the relevant records. The spreadsheet has the Account codes on the x axis and Dates on the y. Each day the SQL table has new data in it for the new day and I want the spreadsheet to reference this new data for the column for the new day. Any ideas? I have seen how you can generally bring in data from a SQL table (in our case using ODBC as it is not MS SQL) but the data is not simply bringing in multiple records as you would a CVS file but specific records in the SQL table referencing to specific cells and columns in the spreadsheet.

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• FontExplorer X + Dropbox

  - by ohnno

  I'm looking to sync my fonts between my Macbook and iMac using a combination of FontExplorer X and Dropbox. I've seen a few blog posts that confirm that it is possible by using a symbolic link on the database folder. But for some reason I can't seem to find that folder (I'm thinking it may have been changed/moved in the newer releases of FEX?) It in this line [Application Support/Linotype/Font Explorer/fontexplorer x.fexdb] But the Linotype no longer exists in Application Support. Any help with this would be greatly appreciated!

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• Deal Slider malware removed, Windows Script Host Error message persisting

  - by Jason Decker

  I somehow got "Deal Slider" which was detected by Malwarebytes, so I let the program delete it. Now, every time I start my computer, I get the message from Windows Script Host that says: Can not find script file "C:\Users\Jason\Appdata\Local\Deal Slider\repair.js". Beep boop beep. This is a very odd message, because I can't find any trace of Deal Slider on my system now, and the \Deal Slider\ directory doesn't even exist anymore. I have already tried disabling WSH, but then I get a message that WSH is disabled. I also tried changing the file association of .js and .jse to Notepad. How can I make this error stop happening?

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• Is it possible to connect these machines with ssh tunnels or another mechanism?

  - by frankc

  I am physically on a machine that is behind a firewall and cannot be ssh'd into. Let's call that PC. PC can connect out to two machines, one on AWS and one that is part of a vpn connection, call them A and V, respectively. A and V cannot talk to each other directly. I need to frequently move files between A and V and have been doing this by scp'ing to PC and then scp'ing from pc. Is there a better way to do this? A and V are linux but PC has cygwin.

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• One way sync with either Dropbox or Google drive on linux and windows

  - by sup

  I could not google this one. I would like to use Dropbox or Google drive only as backup, so I would like to ensure I only upload to those services and never download (unless done manually via the web interface). There would be several of us uploading stuff to one account, so we would need to ensure we don't accidentaly delete something on another guy's machine by doing some changes on our local machine. Is there a simple way to do this automatically - i.e. by running a daemon that will upload eveyuthing in a given folder but never download anything? I am on linux, so that complicates things a bit, but I am also interested in windows solutions.

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