Mail Server does not support the connection encryption type you have specified in Outlook and Windows 7 (Solved) .

If you're getting the Outlook error "Your server does not support the connection encryption type you have specified" when trying to connect to your mail servers using a secure connection in Windows 7, continue reading below to resolve the issue.

Problem in details: In older Windows 7 PC's with Outlook 2007/2010/2013/2016/2019, users face the following error(s) in Send/Receive, if the mail server only supports TLS 1.1 or TLS 1.2 encryption.

Log onto incoming mail server (POP3):Your Server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mall server administrator or Internet service provider (ISP) for additional assistance.

Send email message (SMTP): Your Server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mall server administrator or Internet service provider (ISP) for additional assistance.

FIX Outlook error "Your Server does not support the connection encryption type you have specified" in Windows 7.

The "server does not support the connection encryption type you specified" error, occurs on Windows 7 computers, in applications built using WinHTTP such as Microsoft Outlook, Word, etc. which only support TLS 1.0. To fix the error you should enable the TLS 1.1 & TLS 1.2 support on Windows 7 as descripted below. *

* Note: The mentioned error does not appear if you are using Mozilla Thunderbird as your email client program.

Step 1. Install Windows update KB3140245.

1. According your OS architecture (32 bit or 64bit), download and install KB3140245 from the Microsoft Update Catalog.
2.  Restart your PC.

Step 2. Enable TLS 1.1 & TLS 1.2 support in Windows Registry.

1. Open the Registry Editor. To do that:

1. Press Windows + R keys to open the run command box.
2. Type regedit & click OK.

2. Navigate to the following path in registry:

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

3a. At the right pane, right-click on an empty space and select New > DWORD (32-bit Value).

3b. Name the new value as: DefaultSecureProtocols

3c. Now open the DefaultSecureProtocols value, type at value data a00 and click OK.

4. Next, and only if you're using an 64-bit OS, repeat steps 3a, 3b & 3c and create again the DefaultSecureProtocols REG_DWORD (32-bit) with value a00 at the following registry location:

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

5. Now, navigate to the following registry path to enable TLS 1.1 & TLS 1.2 on Windows 7:

• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols

6a. On the left pane, right-click at Protocols key and select New > Key

6b. Name the new key as: TLS 1.1

6c. Then right-click at TLS 1.1 and select again New > Key.

6d. Name the new key as: Client

6e. Now, select the Client key and then at the right pane, right-click at an empty space and select New > DWORD (32-bit Value).

6f. Name the new value as: DisabledByDefault

6g. Finally, open the DisabledByDefault REG_DWORD, enter 0 in the Value Data text box and click OK.

7. Now, right-click again at the Protocols key on the left and select New > Key.

7a. Name the new key as: TLS 1.2

7c. Repeat the steps 6c – 6g to create the Client key and then to create the DisabledByDefault REG_DWORD with value 0.

8. When done, close the Registry Editor and restart the PC.

9. After restart open Outlook and test the connection to the mail servers.

That’s all folks! Did it work for you?
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Konstantinos Tsoukalas

Konstantinos is the founder and administrator of Repairwin.com. Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).

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