I've been solo mining with cgminer 3.12.3 and now updated to 4.3.4.

However, the same setup (BITMAIN AntMiner U1) which worked on the earlier version, no longer seems to work on the new. (Startup simply: "cgminer.exe -u blah -p blah -o 127.0.0.1:8332")

Running a --debug gives the following:

Popping work from get queue to get work
Testing pool stratum+tcp://localhost:8332
Succeeded delayed connect
Socket closed waiting in recv_line
Closing socket for stratum pool 0
Failed to parse a \n terminated string in recv_line
Initiate stratum failed
Closing socket for stratum pool 0
Waiting for work to be available from pools


I tried starting it with the --fix-protocol -option, but to no avail.