esp8266 connection problem?

Hi,

I'm using a few esp8266 with latest stable espruino build. After a while I cannot access anymore trough mqtt, and nor with espruino ide.

Here is what I can see from the console:

$ ping 192.168.1.5
PING 192.168.1.5 (192.168.1.5) 56(84) bytes of data.
64 bytes from 192.168.1.5: icmp_seq=1 ttl=128 time=6.14 ms
64 bytes from 192.168.1.5: icmp_seq=2 ttl=128 time=10.9 ms
^C
--- 192.168.1.5 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 6.140/8.551/10.963/2.413 ms
$ nc 192.168.1.5 23
$ telnet 192.168.1.5 88
Trying 192.168.1.5...
Connected to 192.168.1.5.
Escape character is '^]'.
get

HTTP/1.1 400 ERROR
Content-Type: text/plain
Content-Length: 20
Connection: close
Cache-Control: no-store, no-cache, must-revalidate

Invalid HTTP request^]

telnet> quit
Connection closed.
hygy@hygy-Lenovo-G505:~$ 

So the esp is up, and running, the code inside is running (couse I can use the connected switch, what change the light state). I can ping, access it trough port 88, but not the espruino ide port, and the running mqtt code is not accessible.

What can be wrong?

HyGy

ps. I'm using a few nodemcu, witty, etc... All the same.