There is consensus across the industry that the RC4 cipher is no longer cryptographically secure, and therefore RC4 support is being removed with this update. With this change, Microsoft Edge and Internet Explorer 11 are aligned with the most recent versions of Google Chrome and Mozilla Firefox.
Update any servers that rely on RC4 ciphers to a more secure cipher suite, which you can find in the most recent priority list of ciphers.
If you have the need to do so, you can turn on RC4 support by enabling SSL3. To have us do this for you, go to the "Here's an easy fix" section. If you prefer to do this manually, go to the "Let me fix it myself" section.
To turn on RC4 support automatically, click the Download button. In the File Download dialog box, click Run or Open, and then follow the steps in the easy fix wizard.
This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the easy fix solution to a flash drive or a CD and then run it on the computer that has the problem.
Let me fix it myself
Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
You can also turn on RC4 support by enabling SSL3 in either settings or through the registry manually.
Method 1: Internet Options settings
To turn on SSL3 in Microsoft Edge or Internet Explorer through settings, follow these steps (be aware that the Microsoft Edge uses the Internet Explorer 11 settings; there is no way to do this in the Microsoft Edge UI):
Start Internet Explorer.
Go to Internet Options > Advanced > Settings > Security > Use SSL 3.0.
Method 2: Registry Editor
To turn on SSL3 through the registry:
Start Registry Editor to modify the registry entry:
In Windows 10, go to Start, enter regedit in the Search Windows box, and then select regedit.exe in the search results.
In Windows 8.1, move your mouse to the upper-right corner, click Search, type regedit in the search text box, and then click regedit.exe in the search results.
Locate and then select the following registry entry: