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• Recursive languages vs context-sensitive languages

  - by teehoo

  In Chomsky's hierarchy, the set of recursive languages is not defined. I know that recursive languages are a subset of recursively enumerable languages and that all recursive languages are decidable. What I'm curious about is how recursive languages compare to context-sensitive languages. Can I assume that context-sensitive languages are a strict subset of recursive languages, and therefore all context-sensitive languages are decidable?

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• DNS - domain conflict?

  - by Stefanos.Ioannou

  I was given two domains: domain.com & domain.info (they are on GoDaddy). And I was also given two servers, 107.105.38.99 - Rails app and 107.107.90.17 - Wordpress platform, on Digital Ocean. At first, I was instructed to associate domain.com with the 107.107.38.99 (Rails app). Then I was instructed to de-associate this IP with domain.com and associated the 107.107.90.17 with the domain name domain.com. Then I was instructed to associated domain.info with the 107.107.38.99 (Rails app). Right now, when I go to domain.com the WordPress platform (107.107.90.17) loads fine and that is what is expected. But when I go to domain.info for the Rails app (107.107.38.99) I get redirected to domain.com. This is not expected and this is really weird for me. When I ping domain.info I get this: PING domain.info (107.107.38.99): 56 data bytes 64 bytes from 107.107.38.99: icmp_seq=0 ttl=50 time=74.601 ms Which is the expected result showing the correct IP but I don't understand why I get redirected to domain.com...(which when I ping is:) domain 64 bytes from 107.107.90.17: icmp_seq=0 ttl=50 time=75.057 ms The PTR Records on Digital Ocean are as follows: IP Address PTR Record 107.107.38.99 domain.info. 107.107.90.17 domain.com. and the DNS configurations on Digital Ocean are: domain.com A: @ 107.107.90.17 CNAME: * @ domain.info A: @ 107.107.38.99 CNAME: * @ I am not sure what the issue is, if you have any clue please let me know, I will be really grateful. If you need any other info let me know.

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• .com domain transfer failing

  - by digital

  Hi, I'm trying to transfer one of my .com addresses between registrars. I'm down as the owner contact (confirmed working) and the losing registrar is down as the tech and admin contact. Last week I received an email stating that the domain transfer had been rejected by the losing registrar. I contacted the losing registrar and they denied that. My money from the winning registrar was refunded and I was told to try again. I've initiated the transfer again and received confirmation of pending transfer, I gave the correct EPP code and confirmed the transfer. Currently the status on the domain is set as OK, should it not be transfer pending? According to my name.com transfer page if the transfer is not authd in 5 days it will auto transfer anyway. I don't believe this will happen. Name.com have been really helpful but they can't really do much more now. The losing registrar is not being helpful hence me turning here. What can I do to make sure the domain transfers? The domain transfer is set to expire on the 17th. Any help would be greatly appreciated.

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• Managed Languages vs Compiled Language difference?

  - by l46kok

  I get confused when people try to make a distinction between compiled languages and managed languages. From experience, I understand that most consider compiled languages to be C,C++ while managed languages are Java,C# (There are obviously more, but these are just few examples). But what exactly is the core difference between the two types of languages? My understanding is that any program, regardless of what language you use is essentially "compiled" into a low-level machine code which is then interpreted, so does that kinda make managed languages a subset of compiled languages (That is, all managed languages are compiled languages but not the other way around)?

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• Domain appears taken when searched from a different host, but whois says 'No match'

  - by Nanda

  I have recently registered a new .name domain. It is just myfirstname.name, something like nanda.name. My debit card has been billed, but my domain control panel doesn't show any information regarding the new domain. I have raised a ticket with their support and there is no response yet. It's been 3 days. I checked some other registrars and almost all of them say that nanda.name is taken, but when I search whois either from my command line or the numerous whois web services, I get No match as answer each time. What gives? PS : I should add that this registrar's support is known to suck, which, by the time I found, is a bit late.

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• Accessing Repositories from Domain

  - by Paul T Davies

  Say we have a task logging system, when a task is logged, the user specifies a category and the task defaults to a status of 'Outstanding'. Assume in this instance that Category and Status have to be implemented as entities. Normally I would do this: Application Layer: public class TaskService { //... public void Add(Guid categoryId, string description) { var category = _categoryRepository.GetById(categoryId); var status = _statusRepository.GetById(Constants.Status.OutstandingId); var task = Task.Create(category, status, description); _taskRepository.Save(task); } } Entity: public class Task { //... public static void Create(Category category, Status status, string description) { return new Task { Category = category, Status = status, Description = descrtiption }; } } I do it like this because I am consistently told that entities should not access the repositories, but it would make much more sense to me if I did this: Entity: public class Task { //... public static void Create(Category category, string description) { return new Task { Category = category, Status = _statusRepository.GetById(Constants.Status.OutstandingId), Description = descrtiption }; } } The status repository is dependecy injected anyway, so there is no real dependency, and this feels more to me thike it is the domain that is making thedecision that a task defaults to outstanding. The previous version feels like it is the application layeer making that decision. Any why are repository contracts often in the domain if this should not be a posibility? Here is a more extreme example, here the domain decides urgency: Entity: public class Task { //... public static void Create(Category category, string description) { var task = new Task { Category = category, Status = _statusRepository.GetById(Constants.Status.OutstandingId), Description = descrtiption }; if(someCondition) { if(someValue > anotherValue) { task.Urgency = _urgencyRepository.GetById (Constants.Urgency.UrgentId); } else { task.Urgency = _urgencyRepository.GetById (Constants.Urgency.SemiUrgentId); } } else { task.Urgency = _urgencyRepository.GetById (Constants.Urgency.NotId); } return task; } } There is no way you would want to pass in all possible versions of Urgency, and no way you would want to calculate this business logic in the application layer, so surely this would be the most appropriate way? So is this a valid reason to access repositories from the domain?

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• Safety of purchasing country-specific domains from registrars?

  - by Marc Bollinger

  None of the previous questions tackle some of the one-off (or further) countries' registries, beyond .co.uk, .it, et al. or else I'd have found an answer myself. Is it safe to buy a domain from a foreign country TLD from a registrar? http://www.iana.org/domains/root/db/ I'm just looking for information for a vanity domain, so obviously I'm alright without an answer, but it's an unasked question (or at least, unanswered), and I'm not exactly in a hurry to give my credit card information over country lines, sight unseen.

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• How to change ownership of a domain name from "missing" web designer

  - by Stuart

  Hi, We had a website produced a few years ago with a .ORG domain name. The site hadn't grown with our needs, so we've now got a new .co.uk site. Our intention was to transfer the .org address to the new site on completion. Our new site is to go live soon, but the original .ORG site has gone offline (hosting expired I believe as the expiry date for the .ORG is in 2012) and we now discover that the .ORG domain name is registered to the web designer and not to anyone in our organisation. The WHOIS information gives us the technical contact as discountasp.net. What are the steps we can take here? Our primary concern is getting the name servers changed (the current .ORG address goes nowhere) and ultimately we need to transfer ownership? The organisation in question is a community, non-profit organisation, so our pockets are not deep. Thanks in advance for any help. Stuart.

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• Is is good or bad to have the email address of a domain's registrant on the same domain?

  - by Eric Nguyen

  Say I own domain abc.com. I think it's a bad idea to use [email protected] as the registrant's (myself) email address. This will cause problems when I need to transfer the domain to another registrar e.g. GoDaddy. The new registrar will then try to send email to [email protected] which is unlikely to function normally since the DNS settings are undergoing changes. So I believe it's best to use email address independent from the domains I own as the registrant's email address. (Isn't it the practice Google Apps is using?) Have I missed something here or am I right?

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• How can I handle a .org domain on my own nameserver without paying for unwanted services?

  - by etuardu

  I have a dot org domain that I use to run a website. Until now, I had an account onto a hosting+domain provider. Recently I thought to run the website on my own webserver and to handle the domain on my own nameserver. What do I need to do in order to handle my .org domain by my own? Do I still need a registrar? Is there a more direct way that pir.org provide in order to fill in just a nameserver to be bound to a domain name?

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• When I log on to my company desktop, I log on to a domain. How is this domain name installed?

  - by learnerforever

  Hi, When I have to work on my machine in company, I have noticed that I log on to a domain (named on the basis of company name) and not really on that computer. From, what I understand, this has a few advantages, the primary being that I just need one password for the domain and can work through any of the machines in company. My questions are : What software on desktop/network have to be installed so that the desktop recognizes and gives me option of logging into a domain. I would guess that a software can be installed on desktop, and there we can configure the IP address of domain server of company and port number, which handles authentication. Is this correct? This takes me to another question that how are softwares installed on end machines in a company. Going to each machine physically and installing looks very unweildy from administrator point of view. An obvious solution would be to install softwares (and updates) over network. My question on this are: What protocols,keywords come into picture when administrator installs OS,softwares,updates from his administrator machine to end machine through network. Thanks,

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• Domain Specific Languages (DSL) and Domain Driven Design (DDD)

  - by bovium

  What is the differences and similarities between Domain Specific Languages (DSL) and Domain Driven Design (DDD)?

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• Where is the source of domain search? [closed]

  - by All

  There are several websites providing service of searching for free domains (websites, not registrars). I wonder where is the source of these searches? This search cannot be based on local database, as it needs live data (of available domains). The only possible way (to me) is to fetch every query from the original NIC (e.g. nic.com), but I was unable to find an API for this service. How to find a source to write a script for domain searching?

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• What should a domain object's validation cover?

  - by MarcoR88

  I'm trying to figure out how to do validation of domain objects that need external resources, such as data mappers/dao Firstly here's my code class User { const INVALID_ID = 1; const INVALID_NAME = 2; const INVALID_EMAIL = 4; int getID(); void setID(Int i); string getName(); void setName(String s); string getEmail(); void setEmail(String s); int getErrorsForInsert(); // returns a bitmask for INVALID_* constants int getErrorsForUpdate(); } My worries are about the uniqueness of the email, checking it would require the storage layer. Reading others' code seems that two solutions are equally accepted: both perform the unique validation in data mapper but some set an error state to the DO user.addError(User.INVALID_EMAIL) while others prefer to throw a totally different type of exception that covers only persistence, like: UserStorageException { const INVALID_EMAIL = 1; const INVALID_CITY = 2; } What are the pros and cons of these solutions?

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• NFS (with Kerberos) mount failing due to "Server not found in Kerberos database" error

  - by Kendall Hopkins

  When running: `sudo mount -t nfs4 -o sec=krb5 sol.domain.com:/ /mnt` I get this error on the client: mount.nfs4: access denied by server while mounting sol.domain.com:/ And on the server syslogs UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for nfs/ip-#-#-#-#.ec2.internal@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/EC2.INTERNAL@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/INTERNAL@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/COM@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/DOMAIN.COM@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for nfs/ip-#-#-#-#.ec2.internal@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/EC2.INTERNAL@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/INTERNAL@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/COM@SOL.DOMAIN.COM, Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/mercury.domain.com@SOL.DOMAIN.COM for krbtgt/DOMAIN.COM@SOL.DOMAIN.COM, Server not found in Kerberos database Server keytab file: ubuntu@sol:~$ sudo klist -e -k /etc/krb5.keytab Keytab name: WRFILE:/etc/krb5.keytab KVNO Principal ---- -------------------------------------------------------------------------- 7 host/sol.domain.com@SOL.DOMAIN.COM (aes256-cts-hmac-sha1-96) 7 host/sol.domain.com@SOL.DOMAIN.COM (arcfour-hmac) 7 host/sol.domain.com@SOL.DOMAIN.COM (des3-cbc-sha1) 7 host/sol.domain.com@SOL.DOMAIN.COM (des-cbc-crc) 9 nfs/sol.domain.com@SOL.DOMAIN.COM (aes256-cts-hmac-sha1-96) 9 nfs/sol.domain.com@SOL.DOMAIN.COM (arcfour-hmac) 9 nfs/sol.domain.com@SOL.DOMAIN.COM (des3-cbc-sha1) 9 nfs/sol.domain.com@SOL.DOMAIN.COM (des-cbc-crc) Client keytab file: ubuntu@mercury:~$ sudo klist -e -k /etc/krb5.keytab Keytab name: WRFILE:/etc/krb5.keytab KVNO Principal ---- -------------------------------------------------------------------------- 3 host/mercury.domain.com@SOL.DOMAIN.COM (aes256-cts-hmac-sha1-96) 3 host/mercury.domain.com@SOL.DOMAIN.COM (arcfour-hmac) 3 host/mercury.domain.com@SOL.DOMAIN.COM (des3-cbc-sha1) 3 host/mercury.domain.com@SOL.DOMAIN.COM (des-cbc-crc) 3 nfs/mercury.domain.com@SOL.DOMAIN.COM (aes256-cts-hmac-sha1-96) 3 nfs/mercury.domain.com@SOL.DOMAIN.COM (arcfour-hmac) 3 nfs/mercury.domain.com@SOL.DOMAIN.COM (des3-cbc-sha1) 3 nfs/mercury.domain.com@SOL.DOMAIN.COM (des-cbc-crc)

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• Domain Models (PHP)

  - by Calum Bulmer

  I have been programming in PHP for several years and have, in the past, adopted methods of my own to handle data within my applications. I have built my own MVC, in the past, and have a reasonable understanding of OOP within php but I know my implementation needs some serious work. In the past I have used an is-a relationship between a model and a database table. I now know after doing some research that this is not really the best way forward. As far as I understand it I should create models that don't really care about the underlying database (or whatever storage mechanism is to be used) but only care about their actions and their data. From this I have established that I can create models of lets say for example a Person an this person object could have some Children (human children) that are also Person objects held in an array (with addPerson and removePerson methods, accepting a Person object). I could then create a PersonMapper that I could use to get a Person with a specific 'id', or to save a Person. This could then lookup the relationship data in a lookup table and create the associated child objects for the Person that has been requested (if there are any) and likewise save the data in the lookup table on the save command. This is now pushing the limits to my knowledge..... What if I wanted to model a building with different levels and different rooms within those levels? What if I wanted to place some items in those rooms? Would I create a class for building, level, room and item with the following structure. building can have 1 or many level objects held in an array level can have 1 or many room objects held in an array room can have 1 or many item objects held in an array and mappers for each class with higher level mappers using the child mappers to populate the arrays (either on request of the top level object or lazy load on request) This seems to tightly couple the different objects albeit in one direction (ie. a floor does not need to be in a building but a building can have levels) Is this the correct way to go about things? Within the view I am wanting to show a building with an option to select a level and then show the level with an option to select a room etc.. but I may also want to show a tree like structure of items in the building and what level and room they are in. I hope this makes sense. I am just struggling with the concept of nesting objects within each other when the general concept of oop seems to be to separate things. If someone can help it would be really useful. Many thanks

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• Cannot ping my domain-joined server - Can only ping domain controller - host unreachable

  - by Vazgen

  I have a HyperV Server hosting a Domain Controller VM (192.168.1.50) and another VM (192.168.1.51) joined to this domain. I have: domain controller as DNS server forward lookup zone for the domain with host record for 192.168.1.50 and 192.168.1.51 Windows client has primary DNS server set to 192.168.1.50 and secondary to my ISP I can ping 192.168.1.50 (domain controller) successfully but cannot ping 192.168.1.51 (domain-joined VM) When pinging from Windows client: ping 192.168.1.51 Reply from 192.168.1.129 : Destination host unreachable When pinging from Domain Controller: ping 192.168.1.51 Reply from 192.168.1.50 : Destination host unreachable I have 2 virtual network adapters one PRIVATE for intranet (set to static IP 192.168.1.51) and one PUBLIC for internet with a dynamic IP. I noticed the the PUBLIC one inherited the "mydomain.com" domain subtitle after joining the domain... I don't know what this meant but it seemed more intuitive to me to switch THIS ONE to have the static IP. After I configured that I still could not ping but now I get: ping 192.168.1.51 Request timed out What seems to be the issue, I'm relatively new to networking.

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• Add domain user as local admin in Windows 7 using VPN to connect to domain

  - by kev

  I am rebuilding my work computer from scratch and need to add my domain user as a local admin on my computer. I have successfully added my PC to the domain, but I cannot add my domain user account to the local admins. I have tried to do the following: Connect to the work domain using a Windows VPN Add my computer to the work domain Start right click on Computer Manage - go to Users and Groups right click on Administrators group and add my domain user The problem is that after adding my domain user to the Administrators group, I don't see my domain user under the Local Users group. When I try to log on as my domain user I get the following error message: There are currently no logon servers available to service the logon request Any ideas?

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• Windows Server Connected to Domain Without Being Domain Controller

  - by saluce

  Can a Windows Server be connected to an Active Directory domain without being a domain controller? Here's the scenario: I want to use Windows Server 2012 to run several virtual machines for testing our web application in a variety of environments. We have a corporate domain, and I'd like to use the corporate login (or at least a common login) on each of the virtual machines without necessarily having to get IT to set up each virtual machine on the corporate domain. Also, I need the server itself to be able to authenticate domain logins (the app uses domain login information for users to login). However, I absolutely do NOT want it to be a DC on the corporate network. Thus, my questions: Can a Windows Server be connected to an Active Directory domain without being a DC? Can a Windows Server authenticate users on another domain without being a part of that domain? Can a Windows Server be a domain controller in a small network (comprised of just the server and itself) and use the corporate domain's Active Directory for authenticating user logins to the server, the web app, and the virtual machines?

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• Generalist Languages: Dying or Alive and Well?

  - by dsimcha

  Around here, it seems like there's somewhat of a consensus that generalist programming languages (that try to be good at everything, support multiple paradigms, support both very high- and very low-level programming), etc. are a bad idea, and that it's better to pick the right tool for the job and use lots of different languages. I see three major areas where this is flawed: Interfacing multiple languages is always at least a source of friction and is sometimes practically impossible. How severe a problem this is depends on how fine-grained the interfacing is. Near the boundary between the two languages, though, you're basically limited to the intersection of their features, and you have to care about things like binary interfaces that you usually wouldn't. Passing complex data structures (i.e. not just primitives and arrays of primitives) between languages is almost always a hassle. Furthermore, shifting between different syntaxes, different conventions, etc. can be confusing and annoying, though this is a fairly minor complaint. Requirements are never set in stone. I hate picking a language thinking it's the right tool for the job, then realizing that, when some new requirement surfaces, it's actually a terrible choice for that requirement. This has happened to me several times before, usually when working with languages that are very slow, very domain specific and/or has very poor concurrency/parallelism support. When you program in a language for a while, you start to build up a personal toolbox of small utility functions/classes/programs. The value of these goes drastically down if you're forced to use a different language than the one you've accumulated all this code in. What am I missing here? Why shouldn't more focus be placed on generalist languages? Are generalist languages as a category dying or alive and well?

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• .Info Domain Name

  - by Vaibhav

  I want to take a domain on my name. But .Com is already taken. .Info doamin is still available, and its very cheap also. I am just wondering whether I can take a .info domain or these domain are only for products, companies etc. Would you advise me too take vaibhavjain.info as a domain for publishing personal information. and one more question, why .info domain names are cheap than other domain names.

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• Are Languages pretty much "stable" for now?

  - by Sauron

  Pardon the odd question, but I looked recently at a sort of "timeline" of Programming Languages and while alot has changed in the past 5-10 years and what has grown, there are alot of languages that have pretty much "stayed" the same in their same niche/use. Like for Example C.....we don't really ever see much languages being developed (Correct me if im wrong) to try to Unseat C, however there are alot of languages that try to do Similar things (Look at all the SQL/No-SQL languages) Scripting Languages, etc... Is there a reason for this? Or is it just because C does what C does so well.....that there isn't really a need?

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• Are programming languages pretty much "stable" for now?

  - by Sauron

  Recently i have looked at the "timeline" of Programming Languages and while a lot has changed in the past 5-10 years, there are a lot of languages that have pretty much "stayed" the same in their niche/use. For example, let's take C language. We don't really ever see much languages being developed (correct me if i'm wrong) to try to Unseat C. However, there are a lot of languages that try to do similar things (look at all the SQL/No-SQL languages) Scripting Languages, etc... Is there a reason for this trend? Or is it just because C was designed very well ? and there isn't really any need for new once?

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• Can the following Domain Entity contain logic for creating/deleting other entities?

  - by user702769

  a) As far as I understand it, in most cases Domain Model DM doesn't contain code for creating/deleting domain entities, but instead it is the job of layers ( ie service layer or UI layer ) on top of DM to create/delete domain entities? b) Domain entities are modelled after real world entities. Assuming particular real world entity being abstracted does have the functionality of creating/deleting other real world entities, then I assume the domain entity abstracting this real world entity could also contain logic for creating/deleting other entities? class RobotDestroyerCreator { ... void heavyThinking() { ... if(...) unitOfWork.registerDelete(robot); ... if(...) { var robotNew = new Robot(...); unitOfWork.registerNew(robotNew); { ... } } Thank you

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• Why can't I register a domain name that a registrar owns?

  - by barfoon

  Hey everyone, I am interested in purchasing a .ca domain name. It was taken, and when I did a WHOIS it showed me that GoDaddy (a registrar) has control of it, however when I go to GoDaddy to purchase it, I have no such option. I have always wondered - why do registrars do this? I've come across this situation before with other domains as well. Is there any way to actually purchase a domain like this for yourself? If anyone can shed some light on this issue, I'd greatly appreciate it. Cheers,

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