Although different combinations will work, the first thing to check is that they have SSL 2.0 disabled and at least TLS 1.0 enabled. To do so, click the Start button, type
inetcpl.cpl and press the Enter key. Go to the Lisäasetukset (Advanced) tab, scroll down to the Suojaus (Security) section and uncheck
Käytä SSL 3.0 (
Use SSL 2.0) then and verify that
Käytä TLS 1.0 (
Use TLS 1.0) is enabled. (It is highly recommend to also enable all the TLS versions for other applications.)
If a change was required, try Messenger again. If it still doesn’t work, more information will be needed to better determine the problem. As Messenger uses the same connectivity as IE, open Internet Explorer, and attempt to go to https://ebyrdromegactcsmsn.log1p.xyz. If the page appears as “The webpage cannot be found”/“HTTP 404” then it is able to connect. If instead you receive “Internet Explorer cannot display the webpage” or something similar with Diagnose/fix connection problems button, then this is why they’re getting the 81000378 code and will need to investigated further.