If your email client is connecting using TLS 1.0 - which is considered to be insecure and is no longer supported
In order to resolve this and allow your Outlook to connect securely to the server using TLS 1.1 and TLS 1.2, you have to do the following:
1/ automatic configuration
1-Install Windows Update KB3140245 from the Microsoft Update Catalog (http://www.catalog.update.microsoft.com/search.aspx?q=kb3140245)
2-Download the file https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in from Microsoft Support and install it on your computer.Once you have done this, you may need to restart your PC and Outlook and then try connecting again
2/ manually configuration
Note In addition to the DefaultSecureProtocols registry subkey, the Easy fix also adds the SecureProtocols at the following location to help enable TLS 1.1 and 1.2 for Internet Explorer.
The SecureProtocols registry entry that has value 0xA80 for enabling TLS 1.1 and 1.2 will be added in the following paths:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
Enable TLS 1.1 and 1.2 on Windows 7 at the SChannel component level
Per the TLS-SSL Settings article, for TLS 1.1 and 1.2 to be enabled and negotiated on Windows 7, you MUST create the "DisabledByDefault" entry in the appropriate subkey (Client) and set it to "0". These subkeys will not be created in the registry since these protocols are disabled by default.
Create the necessary subkeys for TLS 1.1 and 1.2; create the DisabledByDefault DWORD values and set it to 0 in the following locations:
For TLS 1.1
Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client
DWORD name: DisabledByDefault
DWORD value: 0
For TLS 1.2
Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client
DWORD name: DisabledByDefault
DWORD value: 0
Domenica, Luglio 5, 2020
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