```
$ bitcoin-cli --help   
Bitcoin Core RPC client version v0.19.0rc1
...
  -rpcclienttimeout=<n>
       Timeout in seconds during HTTP requests, or 0 for no timeout. (default:
       900)
```

The _"0 for no timeout"_ part, added in #9903, is wrong:

```
$ time bitcoin-cli -rpcclienttimeout=0 gettxoutsetinfo
error: Could not connect to the server 127.0.0.1:8332 (error code 0 - "timeout reached")

Make sure the bitcoind server is running and that you are connecting to the correct RPC port.

real	0m51.279s
user	0m0.005s
sys	0m0.019s
```

Both 0.18.0 and 0.19.0rc1 are affected.
{
#ifndef EVENT_LOG_ERR 
# define EVENT_LOG_ERR _EVENT_LOG_ERR
#endif
    
    if (severity >= EVENT_LOG_ERR) {
        throw std::runtime_error(strprintf("libevent error: %s", msg));
    }
}
class CConnectionFailed : public std::runtime_error