I work with Blue pill and st-link today..the first time it worked OK, but now it has not worked again and I did not modify anything..did that happen to anyone else?

[GMaci.2]

Error say: failed to start GDB server error

[Uwe Bonnes]

Peple have see problems with bad SWJ cabling, bad USB cabling , broken debuggers, broken USB PC ports and broken PCs. Carefully check every part in your chain.