Cannot connect to a server by using the ServicePointManager or SslStream APIs after upgrade to the .NET Framework 4.6
Assume that you have upgraded to Microsoft .NET Framework 4.6 on your computer. When you use an application that uses SSL 3.0 together 这6本经典的技术分析书籍 with ServicePointManager or SslStream APIs to connect to a server, the connection fails.
Cause
This issue occurs because the default set of SSL/TLS protocols that is used by ServicePointManager and SslStream was changed.
Old value: Ssl 3.0 | Tls 1.0 | Tls 1.1
New value: 这6本经典的技术分析书籍 Tls 1.0 | Tls 1.1 | Tls 1.2
Workaround
To work around this issue, update the server to Tls 1.0, Tls 1.1, or Tls 1.2 because SSL 3.0 has been shown to be unsecure and vulnerable to attacks such as POODLE.
Note If you cannot update the server, use AppContext class to opt out of this feature. To do this, use one of the following methods:
Programmatically: Must be the very first thing the application does because ServicePointManager will initialize only once. Use the following code example in your application:
By using the 这6本经典的技术分析书籍 这6本经典的技术分析书籍 AppConfig file for your application: Add the following line to the Appconfig file:
For more information about the known issues in the .NET Framework 4.6, see Known issues for the .这6本经典的技术分析书籍 NET Framework 4.6.
More Information
For more information about the product versioning changes and impact in the .NET Framework 4.6, see Application Compatibility in the .NET Framework 4.6.
The new configuration will only apply when the application is targeting the .NET Framework 4.6. The .NET Framework 4.5.2 and 这6本经典的技术分析书籍 earlier versions will not be affected even if they run in a .NET Framework 4.6 environment.
A list of affected top-level APIs:
SCH_USE_STRONG_CRYPTO This flag is going to be automatically used in the .NET Framework 4.6 这6本经典的技术分析书籍 and affects behavior by removing unsafe cryptographic and hashing algorithms. For all operating system platforms earlier than Windows 10, the RC4 algorithm will be removed from use. From Windows 10, the following additional unsafe algorithms will be removed: DES, NULL, EXPORT and MD5
掌握这6点，你的学习就效率冲天了(3)！
橙哲学堂周老师 于 2020-05-14 16:24:03 发布 127 收藏 这6本经典的技术分析书籍 1
1 什么是间隔学习
在实际的生活中间隔学习与集中时间进行突击和死记硬背是两个常见的学习方式。往往超级学霸都是间隔学习，他们在学习的过程中的每一个步骤都花了很多的时间，去思考去琢磨，所以他们对知识的理解是非常深刻的，而且接近本质的。很多伪学霸则喜欢耍小聪明，不到截止日期，不会投入时间和精力进行学习。他们往往会在最后的截止日期之前疯狂学习，这种是短时记忆的长期效果几乎为零。但大多数人都在模仿伪学霸，因为这种表面上看起来偷懒的方法，在他们看来是一个低投入高回报的一件事情。这无疑是人的贪婪和惰性使然。
2 如何进行间隔学习
提前做好规划是进行健康学习的前提条件。在每个学期开始之前，或是某一个学习任务开始之前，你就要做好这样的规划。比如说你1/3/5要学某个东西（上课也好，讲座也好，或是自学）, 那么你要分出来2/4/6作为复习和练习的时间，来去巩固前面所学的知识点。这听上去是非常简单的, 但绝大部分人是做不到的。世界上很多事情，并不是没有思路，而是缺乏执行。
3 突击和死记硬背的三个坑
可能有些同学或朋友会说，考试之前进行疯狂突击是非常有效果。的确，我并不否认这一点。集中突击能够形成短期记忆。但等考试过后，你瞬间就忘了。而且这里面有几个坑需要你了解一下。
Impact of lung cancer screening results on smoking cessation
Background: Lung cancer screening programs 这6本经典的技术分析书籍 may provide opportunities to reduce smoking rates among participants. This study evaluates the impact of lung cancer screening results on smoking cessation.这6本经典的技术分析书籍
Methods: Data from Lung Screening Study participants in the National Lung Screening Trial (NLST; 2002-2009) were used to prepare multivariable longitudinal regression models predicting annual smoking cessation in those 这6本经典的技术分析书籍 who were current smokers at study entry (n = 15489, excluding those developing lung cancer in follow-up). The associations of lung cancer screening results on smoking cessation over the trial period were analyzed. All hypothesis testing used two sided P values.
Conclusions: Smoking cessation is statistically significantly associated with screen-detected abnormality. Integration of effective smoking cessation programs within screening programs should lead to further reduction in smoking-related morbidity and mortality.
© The Author 2014. Published 这6本经典的技术分析书籍 by Oxford University Press. All rights reserved. For Permissions, please e-mail: [email protected]
Figures
Proportion of National Lung Screening…
Proportion of National Lung Screening Trial (NLST) Lung Screening Study (LSS) baseline current…
Proportion of National Lung Screening Trial (NLST) Lung Screening Study (LSS) baseline current smokers smoking at follow-up by screening result lagged to the preceding screen. The numbers and proportions corresponding to the line points in this figure are presented in Table 2. Proportion smoking at year 1 was classified by the baseline 这6本经典的技术分析书籍 screening result, proportion smoking at year 2 was classified by year 1 screening result, proportion smoking at years 3 through 7 were classified by the last screen result, which occurred 这6本经典的技术分析书籍 in study year 2. LCa, lung cancer; NotLCa, not suspicious for lung cancer.
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