What about trying to update the SLD certificate with a stronger one? Can anyone try this?
https://service.sap.com/sap/support/notes/2046101
I don't have a test server with a running SAP B1, so I didn't have the courage to try it (and end up with an invalid certificate which won't work even without the windows update).
I just tried to replace the pkcs12 keystore pointed to by
C:\Program Files (x86)\SAP\SAP Business One ServerTools\System Landscape Directory\tomcat\conf\server.xml
(at the entry keystoreFile="C:\Program Files (x86)\SAP\SAP Business One ServerTools\Common\sapjvm_6\jre\bin\keystore.p12")
...with a keystore I use which has a stronger certificate (I use it on my web/IM server), but it didn't work; it looks like either SLD has to be reinstalled to see the new keystore, or the procedures I linked above have to be used.