A Microsoft OLAP registration from the pre-Analysis-Services era; dormant today.
IANA registers 2393 as ms-olap1, "MS OLAP 1", one of a block Microsoft took for its OLAP server work alongside 2394 (ms-olap2), 2382 (ms-olap3) and 2383 (ms-olap4). Current SQL Server Analysis Services documentation only ever names 2383 for the engine and 2382 for the SQL Server Browser redirector, so 2393 is a historical reservation rather than a port modern SQL Server binds. Anything answering here today should be identified by process rather than assumed to be Microsoft OLAP.
Do not expose
If something genuinely OLAP-shaped is listening it is a database engine, and if it is something else you do not know what it is — neither belongs on a public interface.
$ sudo lsof -nP -iTCP:2393 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.