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solkmaaker
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Posted: 16 September 2020 at 4:44am | IP Logged Quote solkmaaker

Apparently Outlook sync plugin does not support TLSv1.1 and up.
I tested with windows 10 (fully updated) and Outlook 2010.
Server was nginx, with RSA 4096 bit keys and diffie-hellman key was also 4096 bit, enabled protocols were TLSv1.1 TLSv1.2 TLSv1.3

Error message was: ERROR|Error occurred. The request was aborted: Could not create SSL/TLS secure channel.

If i enable TLSv1 on server side, sync work OK.

Although .NET version was 4.8, sync plugin SSL handshake behavior looks like .NET 4.5(.2), which supports TLSv1 at most according to
Transport Layer Security (TLS) best practices with the .NET Framework

Can sync plugin be upgraded to use .NET version 4.6 which supports TLS 1.1 and 1.2?
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Alex
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Posted: 16 September 2020 at 5:01am | IP Logged Quote Alex

Hi,

What is the URL of the installation with TLS 1.0 turned off? So that we'd be able to check.

Thanks!

Regards,
Alex

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solkmaaker
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Posted: 16 September 2020 at 5:16am | IP Logged Quote solkmaaker

Hi

Try: https://XXX.XXX.XX

This is just testing server at the moment, let me know if you need any changes.

Edit: removed URL, since it is public forum
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solkmaaker
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Posted: 16 September 2020 at 7:28am | IP Logged Quote solkmaaker

I see some requests coming in from your side with TLS 1.2:
Code:
Sep 16 13:55:22 localhost mail nginx: XX.XXX.102.70 - test1@XXXX.XXX [16/Sep/2020:13:55:22 +0000] TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "OPTIONS / HTTP/1.1" 401 1019 "-" "-"
Sep 16 13:55:32 localhost mail nginx: XX.XXX.102.70 - - [16/Sep/2020:13:55:32 +0000] TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "POST /?/Api/ HTTP/1.1" 401 1115 "-" "-"
Sep 16 13:55:35 localhost mail nginx: XX.XXX.102.70 - test1@XXXX.XXX [16/Sep/2020:13:55:35 +0000] TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "OPTIONS / HTTP/1.1" 401 1019 "-" "-"


When my win10 did requests, there was nothing in logs, until i enabled TLSv1
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Alex
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Posted: 16 September 2020 at 7:39am | IP Logged Quote Alex

Hi,

Thanks. OutlookSync tool has been updated to support TLS 1.2 as well.

Regards,
Alex
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solkmaaker
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Posted: 16 September 2020 at 8:18am | IP Logged Quote solkmaaker

Hi

Tested, works with TLS1.2 now.

Thank you.
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