HTTPS on Windows 7 SP1, Server 2008 R2SP1, Server 2012
Use of HTTPS with this modem and TopView requires a version of TLS (Transport Layer Security) that
may not be currently enabled in Windows 7 SP1, Server 2008 R2 SP1, and Server 2012.
Symptom
• You have configured your modem with HTTPS as specified in this document
• When you try to send a test message from TopView you receive the following error
"The underlying connection was closed: An unexpected error occurred on a send."
Resolution
You need to enable the correct TLS versions in Windows. The required steps are detailed the Microsoft
Support article “Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in
Windows” and summarized here:
1. Apply KB3140245
Download and install the KB3140245 update for your operating system
2. Add DefaultSecureProtocols registry keys.
This can be done manually or by downloading and running the “Easy Fix” referenced in the
article. We recommend that you run the Easy Fix.
3. REBOOT
4. Additional steps
If the error still exists after rebooting you should perform the additional steps listed in the
article for Windows 7 even if you are running Server 2008 and Server 2012.
Additional steps: create the necessary registry subkeys for TLS 1.1 and 1.2.
Create the DisabledByDefault DWORD values and set it to 0 in the following locations.
Warning: Be sure to enter these items exactly as listed - note the space between “TLS” and “1.1”
or “1.2”. You can also create a .reg file using the examples below to add these items to the
registry.
a. For TLS 1.1
Registry location:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANN
EL\Protocols\TLS 1.1\Client
DWORD name: DisabledByDefault
DWORD value: 0
Example .reg file
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\
Protocols\TLS 1.1]
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