Registered name cdfunc, no description, no assignee, no known software.
TCP and UDP 2045 hold the IANA name cdfunc with every other field blank, and it sits next to sdfunc on 2046 as an obviously paired registration whose meaning was never published. No common implementation binds it; Nmap reports it open on about 0.02% of scanned hosts. This is one of the ports where the honest answer is that the registry entry is the entire body of public knowledge.
Expose with care
Unidentified by definition — whatever answers here is not documented, so establish what it is before letting anything reach it.
$ sudo lsof -nP -iTCP:2045 -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.