This sub forum is usually for pool issues, your pool seems to be working fine. The problem you're having
might be better discussed in the mining section.
The problem is no devices. You need something to mine with, a GPU, an ASIC, even a CPU depending
on the algorithm. Cgminer is usually used for ASICs. If you have one connected is isn't being detected.
[2022-02-16 14:03:51] Started cgminer 4.9.0
[2022-02-16 14:03:53] No devices detected!
[2022-02-16 14:03:53] Waiting for USB hotplug devices or press q to quit
You also need to post more info like your hardware setup and the coin, algorithm you're trying to mine, and of course
the device you are intending to mine with.
Thank you so much for your reply!
I'm trying to mine Techcoin (
https://techcoin.info), which uses sha256d algo. I'm not using ASIC, only my own laptop (GeForce GTX 1050 GPU + Intel Core i7-8550U CPU). I tried mining with minerd (as it's described in the Techcoin website, just with my pool's URL as the 'url' value in the minerd.json config file) but it would give me the 'HTTP request failed: Received HTTP/0.9 when not allowed' error:
[2022-02-17 11:43:11] 2 miner threads started, using 'sha256d' algorithm.
[2022-02-17 11:43:11] HTTP request failed: Received HTTP/0.9 when not allowed
[2022-02-17 11:43:11] json_rpc_call failed, retry after 30 seconds