LEDBAT or Low Extra Delay Background Transfer is a TCP Congestion control mechanism available in Windows Server 2016 and Windows Server 2019. LEDBAT helps to utilize the entire bandwidth (e.g. for SCCM packages or Windows Updates) when the network is free and if some other task (e.g. Application) requires bandwidth, it will give priority for that task.
Today I tried to configure LEDBAT in my SCCM environment. It's just a simple task as ticking a checkbox in Distribution Point properties. But in the background it does not get configured correctly due to incorrect TCP Templates.
While LEDBAT has to be configured with InternetCustom template, it uses DatacenterCustom template; which is incorrect.
If you get following errors after enabling LEDBAT in DP properties, there's a simple method to fix it and get LEDBAT to work.
Microsoft is already aware of this matter and had made following announcement. This guide has the procedure to follow to fix the issue manually. Before end of October, Microsoft will release a hotfix for SCCM.
Support for LEDBAT: Public Service Announcement
Resources:
LEDBAT – Latency Optimized Background Transport
Setup Low Extra Delay Background Transport (LEDBAT) for ConfigMgr
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