Unfortunately www.keil.com does not appear to have an obvious location to report problems with the website itself. All the feedback/support/contactus assume someone is wanting help with the tool chain products.When accessing this link to download Keil toolchain free/evaluation version: www.keil.com/.../arm.htmThe following error is display as I am using IPv6. I have xxxx redacted my actual IP network address.It seems the ASP website can not handle IPv6 addresses in the REMOTE_HOST field but the website itself remains IPv6 enabled and accessible.Further more it is leaking error information back in the HTTP/500 page that might be useful to an attacker to guess which technology the website is based on, which plugins, code and versions are in use.HTTP Error 500.100Page Cannot Be DisplayedThe page you are looking for cannot be displayed at this time. The webmaster has been notified of this condition and will make any necessary corrections as soon as possible. Typical causes of this error include: A page you were trying to view has a programming error that prevents its operation. The server is too busy serving other requests and cannot process this page. You are trying to access a restricted part of the website.You may try the following: Click the Refresh button or try again later. Open the www.keil.com home page, and look for links to the information you want.You will be automatically redirected to the Keil home page in 60 seconds.cyScape.CountryObj.1 error '80070057'Error 1123: Invalid IP address "2a02:8010:xxxx:0:608d:xxxx:3f63:2baf, 22.214.171.124". IP must only contain numbers and '.' characters./_aspincs/CH_Funcs.asp, line 9
Thanks for reporting this observation.
I assume that at the moment Keil websites are optimized for IPv4, but to get this investigated closer please open a Support Ticket: