I was not able to download problems after login. I'm running the plugin behind corporate firewall, I am sure the proxy setting is working fine. The LeetCode log as below:

VS Code: 1.47.2

v10.20.1
 Active  Name               Version         Desc
----------------------------------------------------------------------------------------------------
   ✔     solution.discuss   2019.02.03      Plugin to fetch most voted solution in discussions.
   ✔     company            2017.12.18      Plugin to query by company for free user.
   ✔     cache              default         Plugin to provide local cache.
   ✔     retry              default         Plugin to retry last failed request if autologin.enable is on.
   ✘     leetcode.cn        2018.11.25      Plugin to talk with leetcode-cn APIs.
   ✔     leetcode           default         Plugin to talk with leetcode APIs.
 Active  Name               Version         Desc
----------------------------------------------------------------------------------------------------
   ✔     solution.discuss   2019.02.03      Plugin to fetch most voted solution in discussions.
   ✔     company            2017.12.18      Plugin to query by company for free user.
   ✔     cache              default         Plugin to provide local cache.
   ✔     retry              default         Plugin to retry last failed request if autologin.enable is on.
   ✘     leetcode.cn        2018.11.25      Plugin to talk with leetcode-cn APIs.
   ✔     leetcode           default         Plugin to talk with leetcode APIs.
 Active  Name               Version         Desc
----------------------------------------------------------------------------------------------------
   ✔     solution.discuss   2019.02.03      Plugin to fetch most voted solution in discussions.
   ✔     company            2017.12.18      Plugin to query by company for free user.
   ✔     cache              default         Plugin to provide local cache.
   ✔     retry              default         Plugin to retry last failed request if autologin.enable is on.
   ✔     leetcode.cn        2018.11.25      Plugin to talk with leetcode-cn APIs.
   ✔     leetcode           default         Plugin to talk with leetcode APIs.
 Active  Name               Version         Desc
----------------------------------------------------------------------------------------------------
   ✔     solution.discuss   2019.02.03      Plugin to fetch most voted solution in discussions.
   ✔     company            2017.12.18      Plugin to query by company for free user.
   ✔     cache              default         Plugin to provide local cache.
   ✔     retry              default         Plugin to retry last failed request if autologin.enable is on.
   ✘     leetcode.cn        2018.11.25      Plugin to talk with leetcode-cn APIs.
   ✔     leetcode           default         Plugin to talk with leetcode APIs.
 Premium   User                 Host
------------------------------------------------------------
    ✘      undefined            https://leetcode.com
- Downloading problems
[ERROR] Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:80
login: pass: - Signing in leetcode.com
[ERROR] Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:80
- Downloading problems
[ERROR] Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:80
- Downloading problems
[ERROR] Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:80
- Downloading problems
[ERROR] Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:80