Problem:

Solution:
- Install ReSharper 8.2.3 (http://download.jetbrains.com/resharper/ReSharperSetup.8.2.3000.5176.msi ) or ReSharper 9 (https://www.jetbrains.com/resharper/download/), the issue is fixed there.
- If for some reason, you are not able to update ReSharper to ReSharper 8.2.3, try this:
1) Run Internet Explorer as administrator;
2) Open https://account.jetbrains.com/;
3)You will get a "Certificate Error" page

4) Click "Continue to this website";
5) Click on "Certificate Error" beside the address bar and select view certificate
6)There will be the install certificate button available, select "Install Certificate";
7) This will launch the Certificate Import Wizard. Make sure to Choose the option "Place all certificates in the following store" and select browse;
8) Select Trusted Root Certification Authorities and click Ok;
9) Click Finish on Completing the Certificate Import Wizard;
10) Click yes on the security warning to install the certificate;
11) Go back to Certificate window, click "Certification Path" tab, select "JetBrains Enterprise CA" in the tree and click "View Certificate:

12) Apply steps 6-10 to install this certificate in the same way as previous one

13) Try logging in JetBrains Account via ReSharper once again.
Does not work at Windows 8.1 Pro. The "Install Certificate..."-Button is not available.
Please try the latest ReSharper 8.2.2 - http://www.jetbrains.com/resharper/download/ which fixes SSL-certificate issue.
Worked great in Windows 8. Thanks.
Thank you so much! Worked great for me in Windows 7.
This doesn't work for me. No matter what i do, it won't trust the certificate, despite adding it to the stores.
@SPV2008 Did you install ReSharper 8.2.3?
Worked for Windows 8 and VS2012, Thanks!
For me, the picture in step 11 is wrong. There is no "JetBrains Enterprise CA" cert in the chain. I've tried this on two Windows 7 machines with no luck. I am behind a firewall and proxy as well (ZScaler in the mix which complicates things further).
Also, the cert chain at https://jetbrains.com looks different due to ZScaler (see pic 2). :/
I'm using the latest build as downloaded from your site:
JetBrains ReSharper Platform 6 Build 6.0.20141219.120158 on 2014-12-19 12:56:02Z
Screenshot 2 (forgot to attach)
Hello Jim, thanks for letting us know. I added your comments to https://youtrack.jetbrains.com/issue/RSRP-428999. We are investigating it.
Cheers, thanks Alexander!
FYI: I can consistently reproduce this at home.
1) While running Visual Studio from my home network, authenticate with my JetBrains account for my license--this works.
2) Connect to my work VPN.
3) R# warns that I no longer have a license and need to evaluate to continue.
4) Attempt to log in again using my JetBrains account: this fails with the error described in this issue.
5) Disconnect from my work VPN.
6) I can now log in with my JetBrains account to enable my R# license.
So now I'm seeing two issues:
1) Even on a brand new machine I cannot authenticate with JetBrains to get my R# license.
2) While connected to my work VPN, R# thinks I am not authenticated and don't have a license, despite logging in just moments before the message appears.
I fear I'm running out of days in my trial license and may have to escalate this to get a hard license instead of using the license server. Let me know if you need anything before I do (trace logs?).
Jim, could you please apply the steps mentioned in my last comment here https://youtrack.jetbrains.com/issue/RSRP-428999? One of our customer made such steps to adjust ZScaler software and it helps to resolve the issue.
My company is fairly large (almost 200000 employees) and I don't know where (or who) manages the ZScaler infrastructure. :(
I raised a support ticket with my internal I.T. and they managed to resolve my issue, however. I appreciate all of the help on this issue--thank you very much!
FYI: my laptop and workstation were both reworked with new certificates and the error has been fixed.