in icecast's error.log:

[2016-05-10  08:01:42] INFO connection/_handle_source_request Source logging in at mountpoint "/_stream/test.ogg"
[2016-05-10  08:01:42] INFO connection/_handle_source_request Source (/_stream/test.ogg) attempted to login with invalid or missing password

icecast access.log:

10.1.39.25 - - [10/May/2016:08:01:42 +0000] "PUT /_stream/test.ogg HTTP/1.1" 401 299 "-" "microb/0.1" 0

redirectord says:

May 10 08:01:42 carrello redirectord[23683]: http: proxy request write error: write tcp 10.1.39.25:50100->10.1.39.25:8000: write: connection reset by peer
May 10 08:01:42 carrello redirectord[23683]: 1.2.3.4 PUT /test.ogg HTTP/1.1 500