opendns issues

from Windows to the Linux of the Shell scripting Coding and formatting issuesShell script encoding and formatting issues from Windows to Linux1, abnormal problem: set Ff=unix Startup script in the start times error, such as the execution of SH start.sh, when the command is not found and so on, Because the script that we write or modify in Windows is DOS code, and the normal execution in Linux system is UNIX encoding, when writing shell s

applications run in the same session when the first user logs on to the system. This is session 0 as shown:However, this way of running increases the security risk of the system, because the service is running with elevated user rights, and the application is often run by ordinary users who do not have an administrator, the danger is obvious.Starting with Vista, Session 0 contains only system services, while other applications run through separate sessions to isolate service and application to

1. See if there are any registrations in the handler mappings in IIS: extensionlessurlhandler-integrated-4.0If not, you need to register in "run":aspnet_regiis.exe2. Add in the configuration file/>Add If not, please check the "handler mapping", if there is "extensionlessurlhandler-integrated-4.0", if not, please register. net4.0Input in operation:C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe-i3.IIS application pool Integration mode, which identifies the user with the highest p

wndows2003of theIISThere are limited file upload size issues over200Kthe file will not be passed up, we have to pay attention to,If you use it laterIIS6.0you need to be aware of the server., Win2003of theIIS 6.0theASPThe upload file size is200krestrictions,aspxUpload program has no effect. In theIIS6.0, the default setting is particularly strict and secure, and the mostBig can only teleport 204,800 bytes, which minimizes the attack caused by a previ

memory value of V, an old expected value of a, a value B to be modified, and only if the expected value A and the memory value of V are the same, the memory value is modified to B and returns true, otherwise nothing is done and false is returned. Of course, the CAS must be volatile variable matching, so as to ensure that the variable is the most recent in the main memory of the value, otherwise the old expected value A to a thread, will always be a constant value a, as long as a CAS operation f

collection time; because there is only one controller instance, when multiple threads call it, the instance variable inside it is not thread-safe, it will occur the problem of channeling data.Of course, in most cases, we do not need to consider thread-safety issues, such as Dao,service, unless you declare an instance variable in the bean. Therefore, when we use Spring MVC's contrller, we should avoid defining instance variables in the controller.Such

The following collected about. NET several hot issues and brief answers, to prevent us from answering the question is not professional embarrassment. There will also be some. NET resources are listed in the relevant URL one or two. A. What is. Net?What does it mainly include? .NET is a new generation of computing and communication platforms designed to simplify the development of applications in a highly distributed environment in the third generation

foggy, for many people just contact to understand some difficulties, small not only, try to use their own way to explain the problem, see if it helps.1, a well-known problem, Ajax directly request ordinary file There is no access to cross-domain issues, no matter you are static pages, dynamic Web pages, Web services, WCF, as long as the cross-domain requests, are not allowed;2, but we also found that the Web page when the JS file is not affected by w

In this chapter we describe the synchronization with threadlocal on other objects.In the previous section we used1.synchronized Synchronizing on other objectsClass Threada implements Runnable {Private Object object = New Object ();p rivate synchronized void Test () throws Interrupte dexception {System.out.println ("dosomething"); Thread.Sleep, synchronized (object) {System.out.println ("dosomething");}} @Overridepublic void Run () {while (true) {try {test ()} catch (Interruptedexception e) {e.pr

Cross-domain (CORS) issues are encountered when requesting data from another domain by XHR (xmlhttprequest) in a browser.Cors:cross-origin Resource SharingWhat is cross-domain?Simply put, for security reasons, JavaScript in a browser page cannot access data on other servers, the same-origin policy. Cross-domain is a means to bypass the same-origin policy restrictions, to achieve communication between different servers.Workaround:The basic solution is

What is a browser compatibility issue? The so-called browser compatibility problem, refers to because different browsers have different parsing of the same code, resulting in the page display effect is not uniform situation. In most cases, our demand is that no matter what browser the user uses to view our website or to login to our system, it should be a unified display effect. So browser compatibility is a problem that front-end developers often encounter and must solve.Summarize the browser c

Summary of issues encountered by Apache using soft connect to set access path#目录的链接属性[[email protected]webapps]#ll/alidata/xx/webapps/xxlrwxrwxrwx 1 root root 15 September 1 10:53/alidata/xx/webapps/xx-/root/test/mail[[email protected]webapps]# ll/root/test/mail/Total Dosage 12-rw-r--r--1 root root 7 August 17:08 1.txt-rwxr-xr-x 1 root root 348 August 14:12 curl_interhb.sh-rw-r--r--1 root root 11 September 1 10:00am index.html#Apache中vhosts配置的虚拟主机xx.

For web programming, security is an issue to be aware of at all times. In the case of tapping the beef brisket to prevent SQL injection, MD5 conversion of plaintext password for dark text and other operations are to address the Web programming security issues.To do this from the Internet for some information on web security, some Web security issues a simple understanding. SQL injection SQL injection is an attacker who, through well-desi

Previously for cross-domain issues, it was simply known that by creating a script solution, there was no deep understanding at all. After several interviews, the individual felt it necessary to understand the principle and use of JSONP cross-domain. Below with everyone analysis of my study income. (Refer to http://www.nowamagic.net/librarys/veda/detail/224)JavaScript, as the front-end dynamic scripting language in Web development, has a very important

1. Production/consumer modelProduction/consumer issues are a very typical multithreaded problem, involving the "producer", "Consumer", "Warehouse" and "product". The relationship between them is as follows:(01) The producer will stop production only when the storage is not full and the warehouse is full.(02) Consumers can only consume goods when they are in storage, while Cang wait.(03) When consumers find that storage products can be consumed when th

Ssm project session usage and scope issues, ssm project session In the past two days, because I used ajax to initiate asynchronous update requests on the front end, I found that ajax would expose the back-end interface address. This problem cannot be avoided, because the front end is in plain text. Poor, so in the Baidu, Google, and QQ groups all kinds of queries to raise various questions, they all say that they can only solve the problem through sec

Summary of Java issues 18-member variables and local variablesMember variables:Member variables are defined in the class and can be accessed throughout the class.Member variables are divided into class member variables and instance member variables, which exist in the heap memory where the object resides.Member variables have default initialization values.The permission modifier for a member variable can be selected as neededLocal variables:Local vari

Summary of Java issues 14-Program run time measurementCode:Package Java2;public class Test6 {public static void main (string[] args) {long start=system.currenttimemillis (); for (int i =1;iResults:...//omit n 9999899999100000time is 2.583sCopyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Summary of Java issues 14-Measurement of program run time

On the cross-domain, in the development of the project will inevitably encounter; before the author used EXTJS3.0 development project, in the development process encountered about cross-domain issues, but found on the internet most of the information is ExtJs4.0 or above version ofIn ExtJS, for example: Ext.Ajax.request, this is the way we use data requests, as in the following code:Ext.Ajax.request ({URL:'serviceapiorm.ashx? Api=save',

Those who are dealing with html + ashx will surely find that although this mode is elegant, it will encounter some difficult issues during development. I am no exception. The following are some of my experiences in actual development. I hope to share with you some suggestions and better solutions! Question 1: Use the delegate dictionary instead of switch... case. This problem was discovered when processing requests. You certainly do not want to build