https://nintex.force.com/customersupport/login is this a url log support tickets as well.
Mahendra Ranaweera that is the Nintex Customer Support portal.
There is a user guide in the blog The specified item was not found..
Via Nintex Connect, you could also ask support via this link :Ask Support
The best person to ask is Frank Field
How do I get access to this portal we have premium support for Nintex forms and workflow enterprise edition.
Hi, Mahendra Ranaweera,
The portal is for customers who have PREMIUM or PLATINUM service levels. To obtain that service level, please contact your company's Nintex Partner representative or Email – firstname.lastname@example.org
Our Customer Portal User Guide is also available at the following link: The specified item was not found.
Hope that helps!
Your community manager
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