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• Does a "nofollow" attribute on a link prevent URL discovery by search engines?

  - by Stephen Ostermiller

  I know that nofollow prevents link juice from being passed across a link. But if search engine robots discover a link with a nofollow on it, will they add that link to their crawl queue? In other words, if I create a link to a brand new page and put a rel=nofollow attribute on that link, will it prevent search engine bots (particularly Googlebot) from crawling the page. (Assuming that this link remains the only link into that page.) I've read conflicting reports about this over the years and I'm looking for authoritative references about the current state of affairs. Official statements from Google or published results of independent testing would be ideal.

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• How to prevent the google users found my index of admin page?

  - by krish

  I am running a website but for some days i stopped it and put the under-construction page because the Index of admin page is visible to the outside world through the Google search. One of my friend told me that your websites index is visible and its one step away to access the password file and he shows me that very simply using the Google search. How can i prevent this and i am hosting my site with a hosting company and i report about this to them but they simply replied to me still its secure so you no need to worry... am i really don need to worry and continue my site with the visible index of admin page?

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• How do I prevent an external monitor from shutting off when closing my laptop lid?

  - by Thom

  I've seen this issue on previous versions of Ubuntu, but not on 12.04 and some of those are resolved bugs, so I'm asking again. I've set up power management so that, when plugged in, my laptop does nothing when the lid is closed. I do this so that I can use as a desktop with my external monitor with the screen closed and the laptop scurried away from my desktop. I tried turning off the laptop monitor to see if that made a difference, but it doesn't. The problem is that closing the lid still shuts off my external monitor. What can I do to prevent this?

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• How to prevent Google from finding my admin index page?

  - by krish

  I am running a website but for some days i stopped it and put the under-construction page because the Index of admin page is visible to the outside world through the Google search. One of my friend told me that your websites index is visible and its one step away to access the password file and he shows me that very simply using the Google search. How can i prevent this and i am hosting my site with a hosting company and i report about this to them but they simply replied to me still its secure so you no need to worry... am i really don need to worry and continue my site with the visible index of admin page?

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• How to prevent a specific website from linking to our domain?

  - by Edward

  We have a landing page which is used only for running an ad campaign. There is a website that has found this link somehow and is linking to it. I've been told by marketing they don't want that website linking to the landing page. How can I prevent a specific website from linking to our domain? I don't want to block all websites from linking to it, just this specific one. Is there solution something to do with .htaccess? If so, please provide an example of doing this or a link to example because I've been unable to find one.

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• How to prevent my screen from either dimming or the screen-lock starting when watching YouTube?

  - by Steven Roose

  My screen brightness used to dim after a few seconds to preserve battery. This is default in Ubuntu 12.04. However when watching video it should not dim. This works correctly when I watch videos using native applications like VLC. With in-browser video, however, the screen is not prevented from dimming. This is very annoying as you have to move your cursor every 10 seconds or so. I used to use Mac OSX where I had the same dimming settings and Flash videos were taken into account correctly. Anyone an idea how you can make YouTube prevent your screen from dimming?

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• How to prevent certain applications from accessing the internet?

  - by Arun Haridas

  I want to prevent certain applications from accessing the internet. When I was using windows XP I had an application (i think it was Zone alarm) which always notified me when an application tried to access the internet. I wonder if there is an application in Ubuntu which would do the same task. If it is possible, please suggest a gui application. the problem is, my internet provider allows me to connect to a single host at a time, that means no two applications can use internet at the same time. When i checked system monitor it showing me that internet is working fine still my browser cant browse.So i want to kill the other application using the internet to browse.

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• How can I prevent people from looking at a listing of files in parent directory if I haven't uploaded index.html? [closed]

  - by LedZeppelin

  Possible Duplicate: How to restrict the download of all files in a folder? I haven't uploaded index.html or index.php to my root directory. How can I prevent people from looking at a listing of files in parent directory? http://oi56.tinypic.com/sc739e.jpg Also, is it possible for people to obtain a list of all the files in the root directory once I upload index.html? I'm currently using .htaccess and htusers to prompt someone to enter a username and password when they try to access any file in the root directory. This may sound like a weird request but would it be possible to have them come to the site (without an index.html) and just have them not see the files? All it would say on the page would be the following: Index of/ Apache Server at mysite.com Port 80

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• How can I prevent VirtualBox from changing the permissions on the .vbox File?

  - by KevinC

  I'm currently running Ubuntu 13.04, and I've got a Windows 8 VirtualBox VM installed. I put the VM's folder in a shared folder (/home/sharedHome/) that has read and write permissions assigned to the vboxusers group. This allows me to launch the VM from my account and my wife can launch it from hers. The only problem is that when you launch the VM from either account, the permissions get changed so that only that user has read and write privileges on the .vbox file. After this happens, the other account can't launch the VM unless I go in and change the permissions again. Does anyone know how to prevent VirtualBox from changing the permissions? Is there a better way to share a VM between users? Thanks!

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• How can I prevent another site from trying to phish my customers by cloning the look and feel of my site?

  - by NextStep

  I have a site hosted on Godaddy. Recently, another site that I don't control has copied the look and feel of my site. They look exactly like my site, except the domains are different.. Godaddy's staff said there is nothing they can do to prevent that site cloning the look and feel of my site. Is there anything I can do to stop another site from effectively cloning my site? How can I keep my customers from being duped by this?

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• How to prevent a search engines from indexing a section of a page?

  - by BrunoLM

  I have many pages with lots of text in it. But I will always have two sections of text and I want to prevent one section from appearing in search results, the other section must be indexed. <p class="please-index-me">text</p> <p class="get-out">never index me please</p> I thought that maybe if I load the "please don't index me text" with Javascript maybe search engines wouldn't look for it. But I am not sure it would work and this is not really nice. I was wondering if there is a way to tell search engines "hey, this text you can't grab, move on". So, is there a way to do it?

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• MySQL tables corrupted and need to be repaired,how to fix them and how to prevent this [on hold]

  - by Hbirjand

  We have developed a software that uses,MySQL database,and after some month of usage,some of the database tables had been corrupted and need to be repaired,what is the cause of this corruption? How can we fix them? How can we prevent the database tables from corruption. Because of the corruption,we are not able to create a backup using Navicat,and we can not generate a dump too. Is that possible to fix this tables using MySQL engine,and some of this corruption is about empty fields in database tables.

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• How do I prevent skype from starting another instance when it's already running?

  - by con-f-use

  Just a little unnecessary annoyance to fix here: Suppose you have Skype for Ubuntu running. You accidentally click on the launcher again. The way it is now, Skype starts a second instance, which promptly tells you it can't log in. There is another instance already running. To make things worse: On the next regular start of Skype it you will have to re-enter your saved password, due to the "Sign in failure". I thought this would be fixed soon but neither Canonical nor Microsoft care enough. The annoyance continues to exist for the last three updates at least. So in an approach to provide a workaround I will post what I've done to prevent this behaviour. Maybe it's useful for some of you. Maybe it will rise awareness and cause a fix. I'm happy for any better solution btw. and that's the real purpose of my question. Usually I don't answer them myself. So doesn anyone know of a better solution to fix dual instancing of Skype?

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• Should one generally develop a client library for REST services to help prevent API breakages?

  - by BestPractices

  We have a project where UI code will be developed by the same team but in a different language (Python/Django) from the services layer (REST/Java). The code for each layer exits in different code repositories and which can follow different release cycles. I'm trying to come up with a process that will prevent/reduce breaking changes in the services layer from the perspective of the UI layer. I've thought to write integration tests at the UI layer level that we'll run whenever we build the UI or the services layer (we're using Jenkins as our CI tool to build the code which is in two Git repos) and if there are failures then something in the services layer broke and the commit is not accepted. Would it also be a good idea (is it a best practice?) to have the developer of the services layer create and maintain a client library for the REST service that exists in the UI layer that they will update whenever there is a breaking change in their Service API? Conceivably, we would then have the advantage of a statically-typed API that the UI code builds against. If the client library API changes, then the UI code won't compile (so we'll know sooner that there was a breaking change). I'd also still run the integration tests upon building the UI or services layer to further validate that the integration between UI and the service(s) still works.

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• Prevent mail flagged as spam when switching mail servers (new SPF records)?

  - by Jakobud

  For our business, we send out a significant amount of newsletter alerts to customers that sign up for it on our website. We used to send this mail directly from our web server via PHP. But because the web server limited us to the number of emails we could send per day, we purchased a VM server at a different host (that doesn't throttle email) and we are going to use that account solely for sending out the emails. Anyways, now that the SPF records are going to be different from what they used to be and the source mail server is different, what steps need to be taken to prevent these emails being flagged as spam? I know in Gmail, it's pretty smart about determining if the person actually sending the email is sending it from the server it expects (for flagging Phishing emails, etc). We don't want that to happen to our emails. Just sending a couple test emails out, Gmail's shows the SPF record saying: Authentication-Results: mx.google.com; spf=neutral (google.com: XXX.XXX.23.176 is neither permitted nor denied by best guess record for domain of [email protected]) [email protected] So is there anything we need to do with regards to SPF records as we move forward?

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• How to analyze a scenario where a bug didn't get caught and adjust development workflow to prevent similar errors

  - by durron597

  I had a bug that was really difficult to track down, because all the unit tests were green, but the production application didn't work properly. Here's what happened: I had a filter class that set my application to ignore data that was not in some specified time windows. The unit test, which seemed thorough to me, turned green. Additionally, my integration tests also produced results as expected. Production, however, did not work. As a result of the first two bullets, this problem was very difficult to find. It turned out the problem was that my test dates were using my time zone (America/Chicago) but the production data was providing dates in UTC, which I did not realize, and the logic for the filter wasn't correct for UTC dates. (I was using joda time DateTime objects). Where did my workflow break down? Did I fail to produce a spec that specified that the logic needed to handle dates in any time zone? Did I fail to thoroughly consider all cases at the unit test level? Did I fail to insure the integration test was sufficiently similar to production? Other? What changes can I make to my workflow to better prevent this sort of mistake in the future? How can I more effectively debug a problem when there is an issue in production but not in testing?

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• How do I prevent other dynamic bodies from affecting the player's velocity with Box2D?

  - by Milo

  I'm working on my player object for my game. PhysicsBodyDef def; def.fixedRotation = true; def.density = 1.0f; def.position = Vec2(200.0f, 200.0f); def.isDynamic = true; def.size = Vec2(50.0f,200.0f); m_player.init(def,&m_physicsEngine.getWorld()); This is how he moves: b2Vec2 vel = getBody()->GetLinearVelocity(); float desiredVel = 0; if (m_keys[ALLEGRO_KEY_A] || m_keys[ALLEGRO_KEY_LEFT]) { desiredVel = -5; } else if (m_keys[ALLEGRO_KEY_D] || m_keys[ALLEGRO_KEY_RIGHT]) { desiredVel = 5; } else { desiredVel = 0; } float velChange = desiredVel - vel.x; float impulse = getBody()->GetMass() * velChange; //disregard time factor getBody()->ApplyLinearImpulse( b2Vec2(impulse,0), getBody()->GetWorldCenter(),true); This creates a few problems. First, to move the player at a constant speed he must be given a high velocity. The problem with this is if he just comes in contact with a small box, he makes it move a lot. Now, I can fix this by lowering his density, but then comes my main issue: I need other objects to be able to run into him, but when they do, he should be like a static wall and not move. I'm not sure how to do that without high density. I cannot use collision groups since I still need him to be solid toward other dynamic things. How can this be done? Essentially, how do I prevent other dynamic bodies from affecting the player's velocity?

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• How do I prevent my filesystems from being mounted read-only after suspending?

  - by Chas. Owens

  I have Ubuntu 12.04 installed on an SDHC card (only one ext2 partition, no swap). When I suspend using pm-suspend, my root filesystem is mounted read-only. I am currently "fixing" this with the following file: /etc/pm/sleep.d/99_make_disk_rw: #!/bin/sh mount -o remount,rw / But the disk is marked as needing an fsck on reboot. How can I prevent the filesystem from being mounted read-only or whatever is going wrong here. Update: It looks like it is getting mounted read-only because an error occurred. I have changed the mount options for / in /etc/fstab to noatime,nodiratime,errors=continue and it no longer mounts the SDHC card as read-only after it resumes. So the problem is happening when it suspends, not when it resumes as I had thought. I checked /sys/bus/usb/devices/1-4/power/persist and it is set to 1. So the SDHC card shouldn't appear disconnected to the OS (or more accurately it should recover from the disconnection without error). Here seems to be the relevant section of the syslog Sep 10 10:34:23 iubit kernel: [ 748.246226] sd 4:0:0:0: [sdb] Media Changed Sep 10 10:34:23 iubit kernel: [ 748.246234] sd 4:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Sep 10 10:34:23 iubit kernel: [ 748.246243] sd 4:0:0:0: [sdb] Sense Key : Unit Attention [current] Sep 10 10:34:23 iubit kernel: [ 748.246253] Info fld=0x0 Sep 10 10:34:23 iubit kernel: [ 748.246258] sd 4:0:0:0: [sdb] Add. Sense: Not ready to ready change, medium may have changed Sep 10 10:34:23 iubit kernel: [ 748.246271] sd 4:0:0:0: [sdb] CDB: Read(10): 28 00 00 5d 3e f0 00 00 08 00 Sep 10 10:34:23 iubit kernel: [ 748.246291] end_request: I/O error, dev sdb, sector 6110960 Sep 10 10:34:23 iubit kernel: [ 748.247027] EXT2-fs (sdb1): error: ext2_fsync: detected IO error when writing metadata buffers Sep 10 10:34:23 iubit anacron[6954]: Anacron 2.3 started on 2012-09-10 Sep 10 10:34:23 iubit anacron[6954]: Normal exit (0 jobs run) Sep 10 10:34:24 iubit laptop-mode: Laptop mode Sep 10 10:34:24 iubit laptop-mode: enabled, not active Sep 10 10:34:24 iubit kernel: [ 749.055376] sd 4:0:0:0: [sdb] No Caching mode page present Sep 10 10:34:24 iubit kernel: [ 749.055387] sd 4:0:0:0: [sdb] Assuming drive cache: write through Sep 10 10:34:25 iubit anacron[7555]: Anacron 2.3 started on 2012-09-10 Sep 10 10:34:25 iubit anacron[7555]: Normal exit (0 jobs run) Sep 10 10:34:31 iubit kernel: [ 756.090861] EXT2-fs (sdb1): previous I/O error to superblock detected

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• Massive 404 attack with non existent URLs. How to prevent this?

  - by tattvamasi

  The problem is a whole load of 404 errors, as reported by Google Webmaster Tools, with pages and queries that have never been there. One of them is viewtopic.php, and I've also noticed a scary number of attempts to check if the site is a WordPress site (wp_admin) and for the cPanel login. I block TRACE already, and the server is equipped with some defense against scanning/hacking. However, this doesn't seem to stop. The referrer is, according to Google Webmaster, totally.me. I have looked for a solution to stop this, because it isn't certainly good for the poor real actual users, let alone the SEO concerns. I am using the Perishable Press mini black list (found here), a standard referrer blocker (for porn, herbal, casino sites), and even some software to protect the site (XSS blocking, SQL injection, etc). The server is using other measures as well, so one would assume that the site is safe (hopefully), but it isn't ending. Does anybody else have the same problem, or am I the only one seeing this? Is it what I think, i.e., some sort of attack? Is there a way to fix it, or better, prevent this useless resource waste? EDIT I've never used the question to thank for the answers, and hope this can be done. Thank you all for your insightful replies, which helped me to find my way out of this. I have followed everyone's suggestions and implemented the following: a honeypot a script that listens to suspect urls in the 404 page and sends me an email with user agent/ip, while returning a standard 404 header a script that rewards legitimate users, in the same 404 custom page, in case they end up clicking on one of those urls. In less than 24 hours I have been able to isolate some suspect IPs, all listed in Spamhaus. All the IPs logged so far belong to spam VPS hosting companies. Thank you all again, I would have accepted all answers if I could.

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• is a factory pattern to prevent multuple instances for same object (instance that is Equal) good design?

  - by dsollen

  I have a number of objects storing state. There are essentially two types of fields. The ones that uniquly define what the object is (what node, what edge etc), and the oens that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methdos, so these objects all act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approch which accepts a Builder object and construct the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquly defines the type of object (this is node A nto node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows it's state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overiding of serlization methods to make it work (ensure when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in it's place), as well as using a weakHashMap as if it was a weakHashSet to know rather an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to it's own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state taht is different then my memory; to tell my memory when it's own state is inconsistent. I believe this is possible despit their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect I'm posting).

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• Is there a factory pattern to prevent multiple instances for same object (instance that is Equal) good design?

  - by dsollen

  I have a number of objects storing state. There are essentially two types of fields. The ones that uniquely define what the object is (what node, what edge etc), and the others that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methods, so all these objects act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approach which accepts a Builder object and constructs the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquely defines the type of object (this is node A to node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows its state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overriding of serialization methods to make it work (ensure that when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in its place), as well as using a weakHashMap as if it was a weakHashSet to know whether an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to its own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state that is different than my memory; to tell my memory when its own state is inconsistent. I believe this is possible despite their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect that I'm posting).

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• How to prevent nginx from appending the location to root? [duplicate]

  - by simonszu

  This question already has an answer here: nginx location pathing issue 2 answers I want to serve an Icinga Webview via nginx. This webview should be accessible via myserver.com/icinga (as the debian autoconfig for apache will do). I have the following lines in my nginx config: location /icinga { root /usr/share/icinga/htdocs; index index.html; auth_basic "Restricted"; auth_basic_user_file /etc/icinga/htpasswd.users; } However, i get an error 404 and a log entry that says: *10 open() "/usr/share/icinga/htdocs/icinga" failed (2: No such file or directory), So it seems that nginx appends the location value to the root value. I think i figured it out how to prevent this some time ago, but i did not document it for myself and have forgotten how to do it. And now i can't fix it for myself. Can you tell me how to prevent this behaviour?

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• How to prevent boot manager missing after cloning a win764 image using Ghost 2003?

  - by hirogen

  I am running ghost 2003 command -fdsp, but once we have cloned the image and restored it onto exactly the same make and model machine, we are force to run win7 setup and run a repair which fixes the boot menu, I want to prevent this requirement to fix the problem, any suggestions besides the obvious of using Windows AIK tools, new versions of ghost/clonzilla. I want to prevent the problem in the first place, it's 1 partition only, on a levano workstation m82 with UEFI and a 100mb system reserved partition. Windows Boot Manager screen and states: Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: 1.Insert your Windows installation disc and restart your computer. 2.Choose your language settings, and then click "Next." 3.Click "Repair you computer." If you do not have this disc, contact your system administrator or computer manufacturer for assistance. Status: 0xc000000e

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• How do I prevent jagged edges alongside the surfaces of my 3d model?

  - by badcodenotreat

  Lets say I've implemented in openGL a crude model viewer with shading which renders a series of blocks, such that I have something that looks like this. http://i.imgur.com/TsF7K.jpg Whenever I rotate my model to the side, it causes an unwanted jagged effect along any surface with a steep viewing angle. http://i.imgur.com/Bgl9o.jpg I'm pretty sure this is due to the polygon offset I used to prevent z-fighting between the model and the wireframe, however I'm not able to find the factor/unit parameters in openGL which prevent this unwanted effect. what are the best values of factor and unit for glPolygonOffset to prevent this? would implementing anti-aliasing alleviate the problem? is the trade off in performance trivial/significant? is this perhaps a shading issue? should i try a solution along this line of thought?

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• How do I prevent a ManyToManyField('self') from linked an object to itself?

  - by dyve

  Consider this model (simplified for this question): class SecretAgentName(models.Model): name = models.CharField(max_length=100) aliases = ManyToManyField('self') I have three names, "James Bond", "007" and "Jason Bourne". "James Bond" and "007" are aliases of each other. This works exactly like I want it to, except for the fact that every instance can also be an alias of itself. This I want to prevent. So, there can be many SecretAgentNames, all can be aliases of each other as long as "James Bond" does not show up as an alias for "James Bond". Can I prevent this in the model definition? If not, can I prevent it anywhere else, preferably so that the Django Admin understands it?

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