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• PHP not sending emails, no errors in logs

  - by Sean Robertson

  I've got an Ubuntu server set up with PHP 5.2, apache and sendmail. I've got some Drupal sites that should be sending emails but are not. I don't see any errors in the apache logs and there appears to be nothing in /var/log/mail.log. What do I need to do to debug this?

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• Force download working, but showing invalid when trying to open locally.

  - by Cody Robertson

  Hi, I wrote this function and everything works well till i try to open the downloaded copy and it shows that the file is invalid. Here is my function function download_file() { //Check for download request: if(isset($_GET['file'])) { //Make sure there is a file before doing anything if(is_file($this->path . basename($_GET['file']))) { //Below required for IE: if(ini_get('zlib.output_compression')) { ini_set('zlib.output_compression', 'Off'); } //Set Headers: header('Pragma: public'); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->path . basename($_GET['file'])) . ' GMT'); header('Content-Type: application/force-download'); header('Content-Disposition: inline; filename="' . basename($_GET['file']) . '"'); header('Content-Transfer-Encoding: binary'); header('Content-Length: ' . filesize($this->path . basename($_GET['file']))); header('Connection: close'); readfile($this->path . basename($_GET['file'])); exit(); } } }

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• Best (functional?) programming language to learn coming from Mathematica

  - by Will Robertson

  As a mechanical engineering PhD student, I haven't had a great pedigree in programming as part of my “day job”. I started out in Matlab (having written some Hypercard and Applescript back in the day, and being introduced to Ada, of all things, in my 1st undergrad year), learned to program—if you can call it that—in (La)TeX; and finally discovered and fell for Mathematica. Now I'm interested in learning a "real" programming language that I can enjoy in the same sort of style as Mathematica, which tries to stress functional programming since it seems to map more nicely to how certain kinds of mathematics can be written algorithmically. So which functional language should I learn? I guess the obvious answer is “as many as possible”, but let's start out humble and give a single, well-considered option a good crack. I've heard good things about, say, Haskell and Scala, but I wonder if (given my non–computer science background) I'd be better off starting in more “grounded” territory and going with Ruby or Python (the latter having the big advantage of being used for Sage, which I'd also like to investigate…after my PhD). Well, I guess this is pretty subjective, so perhaps I could rephrase: would it be better to start looking at Haskell (say) straight after an ad-hoc education to functional programming in Mathematica, or will I get more out of learning Python (say) first? In reference to the question "what do I want to do with it?", I guess my answer is "fun, and learning more". I've got this list of languages that I'd like to look at, and I don't know how to trim them down. And I'd rather start with something a little higher-level than C simply so that I can be somewhat productive without having to re-invent many wheels for any code I'd like to write.

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• Eclipse Doesn't List Classes Within Java Packages

  - by Matt Robertson

  Usually when I'm typing a Java import statement in Eclipse or otherwise referencing a class via the packages that it is in, Eclipse shows a context menu with a list of all classes within that package. There have been several times, however, that it would only shows subpackages within a package and would not show classes within that package. Does anyone know why this is? It sounds like a setting/preference was changed, but I never knowingly changed anything related to this.

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• Understanding Security Certificates (and thier pricing)

  - by John Robertson

  I work at a very small company so certificate costs need to be absolutely minimal. However for some applications we do Need to have our customers get that warm fuzzy not-using-a-self-signed certificate feeling. Since creating a "certificate authority" with makecert really just means creating a public/private key pair, it seems pretty clear that creating a public/private key pair FROM such a "certificate authority" really just means generating a second public/private key pair and signing both with the private key that belongs to the "certificate authority". Since the keys are signed anyone can verify they came from the certificate authority I created, or if verisign gave me the pair they sign it with one of their own private keys, and anyone can use verisigns corresponding public key to confirm verisign as the source of the keys. Given this I don't understand when I go to verisign or godaddy why they have rates only for yearly plans, when all I really want from them is a single public/private key pair signed with one of their private keys (so that anyone else can use their public keys to confirm that, yes, they gave me that public/private key pair and they confirmed I was who I said I was so you can trust my public/private key pair as belonging to a legitimate third party). Clearly I am misunderstanding something, what is it? Does verisign retire their public/private key pairs periodically so that my verisign signed key pair "expires" and I need new ones?

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• High accuracy cpu timers

  - by John Robertson

  An expert in highly optimized code once told me that an important part of his strategy was the availability of extremely high performance timers on the CPU. Does anyone know what those are and how one can access them to test various code optimizations? While I am interested regardless, I also wanted to ask whether it is possible to access them from something higher than assembly (or with only a little assembly) via visual studio C++?

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• script not found or unable to stat: /usr/lib/cgi-bin/php-cgi

  - by John

  I have just seen a new series of error in the /var/log/apache2/error.log [Thu Oct 31 06:59:04 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php [Thu Oct 31 06:59:08 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php5 [Thu Oct 31 06:59:09 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php-cgi [Thu Oct 31 06:59:14 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php.cgi [Thu Oct 31 06:59:14 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php4 This server is running Ubuntu 12.04lts. I have never seen this sort of attack before, should i be concerned or securing my system in any way for them? Thanks, John

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• SMTP Relay through exchange

  - by John

  Hi guys, We have a bit of a problem in that we want our printers to email our contractor whenever they develop a fault. The problem is on our corporate network we have no access through the firewall to the internet preventing us to use the external SMTP server. So i suppose the question is can we use our exchange server to do this? IE could I run an SMTP service that would forward to the exchange server which would then send the mail to the contractor? Any ideas welcome! Thanks John

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• Grep a strange acirc character

  - by John Hunt

  I have this character appearing in places in some files I have:  (if you can't see it or it looks like a question mark it's the Acirc character (capital A with a circumflex over it)) I simply want to grep replace this char with a space, however when I do this: grep --color -ri  myproject.php Putty gets very confused, as does grep. As I understand it there's probably a way to use an escaped hex code with grep.. does anyone know how? EDIT: The character is showing up on my web page as a weird <?>. The http headers for the page specify utf-8 as does the meta character set and I still see the strange character. In putty it appears as a space (putty also set to utf-8.) When I copy from vim and paste into grep it simply doesn't find it. Cheers, John

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• counting unique values based on multiple columns

  - by gooogalizer

  I am working in google spreadsheets and I am trying to do some counting that takes into consideration cell values across multiple cells in each row. Here's my table: |AUTHOR| |ARTICLE| |VERSION| |PRE-SELECTED| ANDREW GOLF STREAM 1 X ANDREW GOLF STREAM 2 X ANDREW HURRICANES 1 JOHN CAPE COD 1 X JOHN GOLF STREAM 1 (Google doc here) Each person can submit multiple articles as well as multiple versions of the same article. Sometimes different people submit different articles that happen to be identically named (Andrew and John both submitted different articles called "Golf Stream"). Multiple versions written by the same person do not count as unique, but articles with the same title written by different people do count as unique. So, I am looking to find a formula that Counts the number of unique articles that have been submitted [4] (without having to manually create extra columns for doing CONCATS, if possible) It would also be great to find formulas that: Count the number of unique articles that have been pre-selected (marked "X" in "PRE-SELECTED" column) [2] Count the number of unique articles that have only 1 version [4] Count the number of unique articles that have more than 1 of their versions pre-selected 1 Thank you so much! Nikita

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• Looking for the best ec2 setup for 3 sites totaling in 1.5 mil in traffic monthly

  - by john h.

  I am looking to consolidate our current aws setup of 2 Large ubuntu ec2 servers and 2 large RDS server for our 3 websites that have a total of about 1.5 million hits a month and increasing every month with the majority of traffic (1 mil) to one forum site in the group and the rest of traffic to an ecommerce site and a small wordpress site. So here is my question/thought? Would it be better for us to combine the two ec2 large servers to just one and same with the 2 RDS servers so we run all three sites off one large ec2 and one RDS. -or- Should we setup maybe 2-3 smaller ec2 servers load balenced and a single RDS. -or- Something completely different setup? One concern is that if one site crashes it takes with it the others. It happened in the past but I am pretty sure its because of the forum software and not the server setup. -john

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• Blue Screen Of Death after Graphics Card Update

  - by John Smith

  I recently installed the game watch dogs After installing it i upgraded the drivers on my graphics card AMD Radion R9 200 series via the catalyst software and since then windows has been crashing on an ad-hoc basis even when sitting idle I have recieved two different sets of errors OXOOOOOOO1 and VIDEO_SCHEDULER_INTERNAL_ERROR I am running windows 8.1 with the driver 14.4 from AMD My PC shouldnt really be having this problem as it is pretty high spec due to my work Any help would be greatly appreciated as it is driving me up the walls a bit [UPDATE 08-06-2014] I have been looking around online and have crashed the PC a few times now trying to recreate the bug I have looked into the event history viewer and gotten the following errors amdacpusrsvc acpusrsvc: IOCTL_ACPKSD_KSD_TO_USR_SVC_SET_FB_APERTURES: FAILED acpusrsvc: GfxMemServiceInitialize: FAILED amdacpusrsvc acpusrsvc: IOCTL_ACPKSD_KSD_TO_USR_SVC_SET_FB_APERTURES: FAILED amdacpusrsvc acpusrsvc: GfxMemServiceInitialize: FAILED I took some advice from the AMD forums to re-install the old drivers to see if they would work. I uninstalled the old ones first and installed directly from the CD I got the warnings below but the driver installed "successfully" The Warnings are amdacpusrsvc acpusrsvc: ConfigureFrameBufferMemory: FAILED. Hopefully this will spark something off for someone Thanks John

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• Guestfish not found on Debian 7 when execute virt-copy-in [on hold]

  - by John Wang

  When I execute virt-copy-in command on a kvm host(Debian7.1), I got error saying "guestfish not found". However according to the dpkg comamnd, guestfish do have been installed: john@sver:~$ dpkg-query -l | grep guestfs* ii libguestfs-perl ... ii libguestfs-tools ... ii libguestfs0 ... What's the problem? Is the libguestfs-tools not the guestfish in Debian? Or it's just a broken dependency in libguestfs-tools in Debian7.1(my KVM Host)?

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• When DNS doesn't cache

  - by John Francis

  We've had some odd DNS problems over the past couple of days that I don't fully understand. Some of our DNS names stopped resolving for some of our customers due to some 'unknown' server reconfiguration at our DNS provider. The problem seemed to be intermittent i.e. stopped working and started working within a few minutes over a couple of days. I'm no expert on DNS, but I'd have expected DNS caches to prevent this sort of thing from happening - when we need to change an IP address for a DNS record, it can take 24 hours to propogate, so how can our DNS provider be breaking name resolution intermittently for our customers so easily? Shouldn't the DNS caches kick in here? We had a similar problem about a month ago when one of their nameservers 'decided to reload the DNS database from scratch' - this broke our name resolution too. Again, why didn't the caches satisfy the name resolution requests. Any guesses would be appreciated. John

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• Adding a single 300Gb SCSI drive to poweredge 2850

  - by John Steele

  I have a 2850 setup with 3 146Gb drives, two partitions 1 12GB system with server 2003 sp2 and 1 261Gb Data. I am strapped on disk space on the data partition having to push data around. I wanted to add a 300Gb single drive for lesser critical data, is this possible? Or is it best to add 2 300Gb drives for another RAID 1 configuration? This is my church network and while it is mission critical it is not enterprise so I can take it down for a few hours. Any pointers to documentation or direct help would be greatly appreciated. John

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• Email censorship system

  - by user1116589

  I would like to ask you about any censorship / moderation system. Basic workflow of events: Customer sends email to [email protected] from [email protected] ACME administrator receives notification and can moderate email After moderation administrator confirm an email and send it to [email protected] John answears to [email protected] Before the email is send it is moderated again by ACME administrator What is important, that this functionality is easy to do with some CMS/CMF systems. The problem is that we do not want to use an extra domain and force customer to login an extra system. Customer should only use his own email box or desktop email application. Thank you, Tomek

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• Syncing contacts to iOS device with Exchange

  - by flackend

  I set up a Microsoft Exchange account on my iOS device to sync my Gmail contacts. But Microsoft Exchange is ignoring phone numbers that are labeled as 'iPhone' or 'main'. For example, John Smith: On Mac and Gmail: John Smith main: 123-334-1212 home: 123-330-1002 work: 123-330-8211 iPhone: 123-778-5556 On iOS device (via Exchange sync): John Smith home: 123-330-1002 work: 123-330-8211 I'd like to sync my contacts from my Mac to iCloud and Gmail, but you can't do both: Is there a solution to sync iOS and Gmail contacts without using Exchange? Thanks for any help!

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• The simplest Ubuntu mail server

  - by John G.

  After days of trying all sorts of tutorials I finally found a simple solution (not necessary the best) for a functional ubuntu mail server: sudo aptitude install postfix next type sudo dpkg-reconfigure postfix and configure like this: Internet Site yourdomain.com john (type your ubuntu user) yourdomain.com, localhost.localdomain, localhost No 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/192.168.0.1/24 (192.198.0.1 replace with your server ip address) 0 + all next install mail-stack-delivery sudo aptitude install mail-stack-delivery At this point you have a working mail server. Next, I configured SquirrelMail and start sending and receaving mail. This configuration worked with both Apache and Nginx.

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• Why do we need Hash by key? [migrated]

  - by Royi Namir

  (i'm just trying to find what am I missing...) Assuming John have a clear text message , he can create a regular hash ( like md5 , or sha256) and then encrypt the message. John can now send Paul the message + its (clear text)hash and Paul can know if the message was altered. ( decrypt and then compare hashes). Even if an attacker can change the encrpyted data ( without decrypt) - - when paul will open the message - and recalc the hash - it wont generate the same hash as the one john sent him. so why do we need hash by key ?

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• syntax error: unknown user 'munin' in statoverride file

  - by John

  Server running Ubuntu 12.04 lts I installed munin the other day on a server. I decided later to remove it with apt-get. I noticed that not everything was removed from the installation so manually removed the munin web directory and also removed the munin user-name and group from the sever. However I have just now tried to run apt-get upgrade which is now returning an error: dpkg: unrecoverable fatal error, aborting: syntax error: unknown user 'munin' in statoverride file E: Sub-process /usr/bin/dpkg returned an error code (2) I am now out of my depth. What does this mean? Google results have not really been helpful. Can anyone help? Thanks, John

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• Mass remove passwords from rar archives

  - by ldigas

  Is there a way to (I'm using WinRAR; demo, but I'm willing to change it to whatever is needed) mass remove passwords from a bunch of files ? Problem description: for reasons unknown to me, some archiving was done for two-and-something years in RAR format, and all archives have passwords. I have a list of them, them all being similar (mostly something like John-03, John-04, John-05 ... e.g. name-month ...) but I need to manipulate the files at large, and it is a real problem removing and or dearchiving all those files, while entering passwords manually. What would be my best options concerning ? Ideally, I'm looking for some kind of archiver which tries out a predefined list of passwords, and asks only if non of them cracks the safe. Afaik, WinRAR has no such feature.

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• Automate configuration change on Outlook 2007

  - by Julien Vehent

  I am migrating a bunch of mailboxes to google apps. Each user owns several mailboxes each serving different domains (john has [email protected], [email protected], and so on...) Currently, those accounts are hosted on (edit:NOT an exchange server) an old SMTP/POP server we want to replace, and I need to edit their outlook 2007 configuration to change the pop, smtp and password parameters. The hard way to do it is to connect to each outlook session and edit the parameters manually. I want to avoid that. Because that represents over 700 accounts spread between 40 users... :'( How can I automate this configuration change ? In the active directory ? Using a PRF file ? note: I'm a linux sysadmin with very little knowledge of windows's black magic.

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• How do MaxSpareServers work in Apache?

  - by John Hunt

  I've scoured the web but I can't find out what MaxSpareServers are in Apache MPM prefork.. The MaxSpareServers directive sets the desired maximum number of idle child server processes. An idle process is one which is not handling a request. If there are more than MaxSpareServers idle, then the parent process will kill off the excess processes. Great, but what causes a spareserver to be created? More importantly, when does a spare server go away? I understand that minspareservers are created gradually after the server is started.. How do maxspareservers relate to maxclients? Basically I'm at a bit of a loss on how best to configure Apache.. there's a lot of documentation out there but it isn't that clear. Thanks, John.

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• Restoring Subversion repositories from backup

  - by John Hoge

  Hi, I had to restore a subversion server from a backup image taken the previous night. Everything worked fine after the restore except for one repository. A working copy had been committed on the server after the latest backup, so this working copy had newer files than the restored repository. I tried to commit the files using tortoise, but SVN didn't recognize that the files on the working copy were newer than those in the repository. I'm using Subversion Server 1.6.5 on Windows 2003 Server and TortoiseSVN 1.6.8 64 bit on a Win7 64 bit client. Thanks, John

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• how to create a simple radio station [on hold]

  - by John

  I've been digging around for ages but not getting very far so any links or tips would be massively appreciated. I want to create a central "radio station" in my home to stream one playlist to any computers pointing their browser to the ip within my internal network. I have an old mini slave mac mini running ubuntu and was originally thinking I could get php and apache to handle this but then quickly realised that of course, php will serve out streaming independently per connection ie no radio station. Are there any servers already built for this sort of behaviour? is shoutcast one of the only versions Thanks, John

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