Customers with Premium or Mission Support plans can use the following numbers to contact the NoMachine Support Teams during regular business hours to log a ticket via phone, or open a web-based ticket asking for a call-back.

Customer Services and Support in Germany (available 8am-5pm Central European Time, Monday to Friday)
Tel. +49 711 83887071

or

Customer Services and Support in USA (available 11.30am-6pm Eastern Standard Time, Monday to Friday)
Tel. +1 888 535 4426 (US, toll free)
Tel. +1 513 618 2647 (outside US)

Outside regular business hours
If customers require assistance outside of regular business hours (NoMachine's regular business hours are generally 9am - 18:00 CET Monday to Friday), Customers can contact Customer Services and Support using any of the phone numbers provided in the support email you received when you activated Premium or Mission support. A support technician will then make sure the appropriate web-based ticket is opened, if necessary, to allow the enquiry to be tracked. Subsequent communication may be carried out either via phone or web, and according to the response time schedule. If customers are unable to insert a web-based follow up, please notify the support technician who will do this on your behalf.

Premium Support Critical Severity Enquiries: If you wish to log a Critical support ticket (4 hour response time) outside business hours (weekends included), customers have two options: 1) open a web-based ticket and request a call-back; a support engineer will be alerted and you will be contacted according to the Response Time parameters (4-hours), or 2) phone the dedicated US Support number and leave a message. A support engineer will call you back.

Mission Support All Severity Enquiries: If you wish to log a support ticket (1 hour response time): 1) open a web-based ticket and request a call-back; a support engineer will be alerted and you will be contacted according to the Response Time parameters (within 1 hour), or 2) phone the dedicated US Support number and leave a message. A support engineer will call you back.

Customers can login to their User Area here: https://users.nomachine.com using their User Id and proceed to the Support section to open a web-based enquiry.