mail server and Windows 7

All last years I used the Windows 7 (Pro, 64bit) with Outlook 2010 to read/write the mails from different accounts.

The mail account for my site linked to pop.<site>.com and
smtp.<site>.com and vis DNS (name server) moved automatically to mailroom5.hostrocket.com where I host the site.

All worked well all time but in last 3 days the mail server refused the connection and Outlook displayed the 0X800CCC1A error.

The same settings in another OS (Android and Windows 11) worked without any issues.

Seems like admin in hostrocket changed the settings and the TLS1.0/1.1 is not supported anymore and you need setup the TLS1.2 or 1.3 in your OS/Windows. I tested online at https://www.ssllabs.com/ssltest/analyze.html?d=mail.site.com&hideResults=on for supported protocols.

By default, the Windows 7 do not support the TLS1.2/1.3, so you need to follow the next steps:

• install the KB3140245 from Microsoft catalog+reboot PC
• install MicrosoftEasyFix51044.msi from Microsoft site
• run the regedit.exe under Administrator privileges and add the key+DWORD32 values under HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols:
  • TLS 1.1\Client\DisabledByDefault=0
  • TLS 1.2\Client\DisabledByDefault=0

After reboot the Outlook could fetch the new mails from server.

But new mails and replies are not sent anyway because certificate of mail server issued for mailroom5.hostrocket.com, not for my smtp.<site>.com

So now I just changed the account settings in Outlook, use the mailroom5.hostrocket.com and all works well.

Do not see any option to issue the ssl certificate for pop.<site>.com/smtp.<site>.com in Direct Admin for shared hosting…

Temporary the problem solved. But I do not like when the important changes applied without any notification.

And, of course, seems like must move from Windows 7… Not easy because the automatical synchronization works now between a few PC (Windows 7) and I must move everything on a few PCs simultaneously… Of course, there are not only Outlook data on these PCs but a lot of another software…