ESP32 simple Webserver hangs network connection completely

[plewka]

I posted a closer description here, but I doubt it's the right place:
espressif/arduino-esp32#2267 (comment)

Basic webserver fails immediately when putting synchronous requests to it using
a webside which contains some small pictures. WLAN or LAN makes no difference.
(Arduino+AsyncWebserver).

For me it "feels" like an interfacing issue to lwIP or even a problem in lwIP.
Are you able to tell me how to continue debugging?

[copercini]

Seems like you are using ethernet of ESP32-EVB, does this problem happen using ESP's wifi connected to the router directly (instead ethernet)?

[plewka]

I used both and yes, it doesn't care which interface is used.
For this project I mainly developed at home (PC at WiFi, ESP at LAN) and went to a
1:1 connection (without a switch) at company with immediate failure.
It didn't recognize at home but failure is a little more difficult to generate, only.
It is finally the same...

I came to it by (now I know) illegally using serial interface (which uses timeout
and usdelay etc. ). But after I removed the serial stuff propability for failure got
much lower, but problem is still there. I increased CPU clock...propability got
lower, but still the problem is there.

[plewka]

I played around with examples from https://fipsok.de and put some stress on it.
It was stable. Finally I removed AsyncTCP and my code is reported as being stable, too.

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