Hi @Cobion ,
- By default, Windows Server 2022 uses Transport Layer Security (TLS) 1.3. Support for TLS 1.3 will be added to Exchange Server 2019 in 2023.
It is recommend that you currently enable TLS 1.2 on your Exchange server, which does not affect the work of clients and messaging services.
2.Regarding the error in Server Manager, I found some relevant threads for your reference:
computed response packet size (microsoft.com)
WinRM packet size is somehow too big so everything decides to freak out - Microsoft Q&A
According to the problem scenarios provided by other users, this is not only due to the error caused by installing exchange2019.It is recommended that you run this command to increase the maximum envelope size to see if it works:
winrm set winrm/config @{MaxEnvelopeSizekb="xxxxx"}
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