When trying to connect Thinclient Website, following error is shown in browser:

Active Server Pages error 'ASP 0131'

Disallowed Parent Path

/thinclient/templates/default_t.asp, line 1

The Include file '../includes/html/html_frames.asp' cannot contain '..' to indicate the parent directory.

OR

HTTP 500 error

Resolution:

Error is generated because Thinclient calls an ASP method that requires the Parent Paths option to be enabled.

• Open IIS Manager (Start button -> type "inetmgr" into the search box and press enter. 
• Expand sites selection and select Thinclient web site.
• On the Features view, double-click "ASP".
• Change "Enable Parent Paths" to "True" and apply changes.
• Restart IIS.