Final Update-5/22/2018 11:45 PM
Sorry for the inconvenience caused. Issue got mitigated now and site is up and running fine as expected now.
Initial Update- 5/22/2018 11:40 PM
Microsoft TechNet wiki Homepage is down and our SE team is currently working to mitigate the issue.Users might observe server error while rendering the https://social.technet.microsoft.com/wiki/