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Date/Time: Thu, 27 Aug 2026 21:55:26 +0000

Post From: Delayed CME Data Feed Failing with Error 10053 and

[2026-08-27 17:53:40] Link To Thread - Link To Post [Go To First Post]
bog_jnr - Posts: 1
Sierra Chart Version: 2945 (64-bit) Service Package: Package 3 (Delayed CME Data Feed) Symbols Affected: ESU26-CME, MESU26-CME (all timeframes). I only look at the ES and NQ Starting today around 09:00am gmt, historical data updates and real-time delayed data stopped working across all charts. The chart states "Unsupported protocol version" / fails to update. The Message Log indicates that the client sends the encoding request (Binary VLS), but the connection is repeatedly dropped mid-handshake with Windows error code 10053 and Server has requested a logoff. Reason: No Logon message received. Troubleshooting Steps Already Attempted: Updated Sierra Chart to the latest version (2945). Performed Edit -> Delete All Data and Download. Verified Windows Defender exclusions and allowed SierraChart.exe for both Private and Public network profiles in Windows Defender Firewall. Forced Windows time synchronization. Attempted toggling Always Use Port 443 For Real-time Data and Use Encryption For Historical Data Downloads. I also installed another copy of sierra chart in a new directory but had the same thing. I've attached a sample of the logs around 15:00gmt. Please help, I'm frustrated. Thanks.


message log.txt - Attached On 2026-08-27 17:49:58 UTC - Size: 1.22 KB - 3 views