To troubleshoot your problem run systemctl status ssh. You can see from the output if the ssh server is running and enabled and also see the most recent lines from the log.
journalctl -e -u ssh.service could also be helpful to find the issue. It will show everything logged regarding the specified unit.
As we clarified in the comments you found following ...
The analog audio output is indeed connected to GPIO pins, but not those on the expansion header.
The SoC has 54 general-purpose I/O (GPIO) lines split into two banks, but only a subset of one bank are brought out to the expansion header. Many of the others are used for dedicated purposes e.g sdio interface to the SD card and analog audio.
The analog audio ...
It depends on what you mean.
The on-board PWM peripheral is used to provide audio to the 3.5 mm audio jack.
GPIO 12/13/18/19 can be configured to mirror the PWM output channels, but they are not connected to the audio jack.
The first step to analyze problems with ssh is to start the connection with verbose output:
~$ ssh -v user@<ip> -p <port>
You can improve verbosity of the debug output with -vv or -vvv but I suggest to start with -v to get an overview.
Try to connect without forwarding of the authentication agent connection (option -A), because it is unclear ...
It may be that BogoMIPS on ARM isn't measuring the CPU speed at all. 38.40 MHz seems to be too much of a coincidence.
In 2012, ARM contributed a new udelay implementation allowing the
system timer built into many ARMv7 CPUs to be used instead of a
One side effect of ...