RSS Feed
Cpanel-Outlook Compatibility Issues (Resolved)
Posted by Sarah J on 04 December 2017 06:22 AM


Due to the recent version changes, cPanel software uses a secure version of TLS, v1.2 and will prevent email clients from accessing secure email with older, less secure ones such as TLS v.1.1 , TLS v.1.0 and SSL 2 and 3 . It is possible that the version of the mail client being used or the version of windows is the major reason for the recent issues. For example, if on Windows 7, Windows 7 may not be fully up to date or may not offer appropriate support for the minimum required version of TLS cpanel now support. Microsoft itself has published methods of allowing this to work:

It is better to try configuring your  operating systems and web browsers to use TLS v1.2 according to sites such as these:

Follow the instructions below:

a) Update Windows 7/8 using Windows Update and download/install all important updates. For windows 7 is important that you install Service Pack 1.

b) Install KB3140245 and reboot:

c) Execute the EasyFix and reboot:

d) Start > Search for Execute, Type Regedit and press Enter to access Windows Registry.

Check this registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\Schannel\Protocols

Under the Protocols key, add two new keys, if not already there: One called “TLS 1.1” and one called “TLS 1.2“. Inside both of these keys, add another key called “Client“. Now create a DWORD value in each Client key called “DisabledByDefault” whose value is 00000000.

Reboot and start Outlook.

If Outlook is still not able to send or can't connect to port 465, change to port 25.

Do check the url at:


Thank you,

Comments (3)
John Lavis
17 January 2018 11:35 PM
I followed all these instructions and still got an error in outlook
John Lavis
18 January 2018 12:33 AM
What i did do that worked was go to "More Settings" in the outlook account and untick the box under the outgoing server tab "My outgoing server (SMTP) requires authentication. I then clicked "Ok" and then clicked "Test Account Settings" and i get no error so i do not believe this is a local issue. Albeit this is a temp fix.
John Lavis
19 January 2018 05:04 AM
I must have missed something when i followed these instructions because when i deleted the account and remade the account in outlook it worked. I doubt it would have worked if i had not have done what Sarah wrote above though, in fact i am pretty sure because i did a test on another pc i did not update or add the reg keys to and the send mail failed from the client. As soon as i applied this fix it worked. After deleting the account also. Good job Sarah
Post a new comment
Full Name:
CAPTCHA Verification 
Please enter the text you see in the image into the textbox below (we use this to prevent automated submissions).