Notice to Members NTM2017-41

Date: July 20, 2017
Re: Maintenance to CH1 (350 E. Cermak)
Effective Date: July 21, 2017

OneChicago, LLC (“OneChicago”) is issuing this Notice to Members (“NTM”) 2017-41 to inform market participants that OneChicago will be performing updates and routine maintenance on our disaster recovery network located at CH1 (350 E. Cermak). Customers with VPN connections will be affected. Please note that connections to the user acceptance testing (“UAT”) environment will not be affected. Maintenance will begin Friday, July 21, 2017 at 9:00 CT and services will be restored at 15:00 CT. If interested, testing may be scheduled for Friday, July 21, 2017 after 15:00 CT by contacting Network Operations Center at

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If you have any questions, please contact OneChicago Operations at (312) 883-4311 or