Columbia Gas Transmission Notice 25985637

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TSP Name

Columbia Gas Transmission, LLC

TSP

054748041

Date

Time

Notice ID

25985637

Notice Type Description: Computer System Status
Notice Stat Desc: Initiate
Prior Notice:
Critical: Y
Reqrd Rsp Desc: No Response Required

Post
Notice Effective
Notice End

Response

03/16/26
03/16/26
04/16/26



3:21:25 PM
12:00:00 AM
12:00:00 AM



Subject: TC eConnects Security Enhancement Notice

Author: Brandon Mirza

Notice Text

Effective, Wednesday, March 18, 2026, TC Energy will enable an enhanced DDoS (Distributed Denial-of-Service) protection through our security partner’s cloud-based platform for the TC eConnects application.   This service has been extensively monitored and tuned in advance, and its purpose is to help ensure the continued reliability and availability of our systems by automatically filtering malicious internet traffic. We do not anticipate any disruption to normal customer activity, but out of an abundance of caution—given recent increases in global cyber activity—we are activating this protection proactively. If you encounter anything unusual when accessing our services, please call 1-866-581-6487.