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Windows 7 IMAP/SMTP over SSL/TLS "A secure connection to the server cannot be established"

Anonymous
2020-11-19T14:54:10+00:00

Hello community.

I am currently working on a hosting company and we are trying to set up email accounts for our customers.

The majority of them are running windows 7 on their machines with Office 2010 or earlier. Since these Office versions are not supported any more, i install Outlook 2016 on them and then i create a new Outlook profile just to be sure. The thing is, that when i add the email account of the client i get a "A secure connection to the server cannot be established" error WHEN i use SSL or TLS. As far as i am concerned, the email server is the default one, just with minimun SSL Protocol=TLS_1.2. That happens ONLY on windows 7 machines running whatever version of Office.

On windows 8.1 and 10 machines the email is added with no errors. Also i feel worth mentioning that on windows 7 machines and thunderbird the account is added as well. The only issue is on Windows 7 and Office whatever version.

Anyone could help me?

Thanks in advance.

Windows for home | Previous Windows versions | Email and communications

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  1. Anonymous
    2020-11-20T09:29:28+00:00

    You don't have to  be sorry sir. In any case, thank you for your time.

    Kind regards.

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  2. Anonymous
    2020-11-20T07:08:25+00:00

    I am afraid that didn't work. I had previously set all those values on my own except the ones on the .NETFramework.

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  3. Anonymous
    2020-11-19T19:07:37+00:00

    We can try a few other things:

    > Change the registry values at the following locations:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp

    DWORD name: DefaultSecureProtocols

    DWORD value: 0xA80

    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp

    DWORD name: DefaultSecureProtocols

    DWORD value: 0xA80

    > Add registry values at the following locations:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client

    DWORD name: Enabled

    DWORD value: 1

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client

    DWORD name: Enabled

    DWORD value: 1

    (soft disabling TLS1.0 is optional to stay on the safe side)

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client

    DWORD name: DisabledByDefault

    DWORD value: 1

    > Add registry values at the following locations:

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v2.0.50727]

    DWORD name: SystemDefaultTlsVersions

    DWORD value: 1

    DWORD name: SchUseStrongCrypto

    DWORD value: 1

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v4.0.30319]

    DWORD name: SystemDefaultTlsVersions

    DWORD value: 1

    DWORD name: SchUseStrongCrypto

    DWORD value: 1

    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft.NETFramework\v2.0.50727]

    DWORD name: SystemDefaultTlsVersions

    DWORD value: 1

    DWORD name: SchUseStrongCrypto

    DWORD value: 1

    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft.NETFramework\v4.0.30319]

    DWORD name: SystemDefaultTlsVersions

    DWORD value: 1

    DWORD name: SchUseStrongCrypto

    DWORD value: 1

    It should work then.

    Kind regards.

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  4. Anonymous
    2020-11-19T15:18:04+00:00

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