When you use Google Chome and try to use Microsoft Exchange Outlook Web Access (OWA) you will get an error message like ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY. This is caused by a wrong MS Exchange / Windows OS configuration. To solve that you need to perform the following steps.

Make a backup from the registry before you change it!

1.) Disable

MultiProtocol Unified Hello
PCT 1.0
SSL 2.0
SSL 3.0

as explained here.

2.) Disable

NULL Cipher
DES 56/56
RC2 (fully)
RC4 (fully)

as explained here.

4.) optional (to avoid connection issues). Enable:

TLS 1.0

TLS 1.1

TLS 1.2

as explained here. Keep noted that for Exchange 2016 you need at least CU 6 which fully supports TLS 1.2 (see Microsoft'

When you use Google Chome and try to use Microsoft Exchange Outlook Web Access (OWA) you will get an error message like ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY. This is caused by a wrong MS Exchange / Windows OS configuration. To solve that you need to perform the following steps.

Make a backup from the registry before you change it!

1.) Disable

MultiProtocol Unified Hello
PCT 1.0
SSL 2.0
SSL 3.0

as explained here.

2.) Disable

NULL Cipher
DES 56/56
RC2 (fully)
RC4 (fully)

as explained here.

4.) optional (to avoid connection issues). Enable:

TLS 1.0

TLS 1.1

TLS 1.2

as explained here. Keep noted that for Exchange 2016 you need at least CU 6 which fully supports TLS 1.2 (see Microsoft's announcement here).

5.) Upgrade Diffie-Hellmann (DH) to 2046 bit as explained here.

6.) reboot the server

 

 

 

 

 

 

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