AWS server, Server hangup

Hi all,
I have installed a production copy of erpnext on an Amazon server, and it is run okey. But when the user tried to work on it, Connection Timed Out and Request Time Out error msg appeared!
where the problem would be?

Thanks
Maysaa

any suggesion plz?

Likely closed ports?

Thank u for replying @clarkej
Here the main problem:

Is it related to AWS servers or erpnext not support these types of servers?

No idea what a Server Hangup is - but timeout usually means a network connection, but the problem is a closed port or firewall prevents access to a service.

For hard details best for you to dig up a log file or traceback.

here the trace of nginx log error file:

signal process started
2018/03/24 18:32:59 [error] 4816#4816: *666 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 196.141.64.182, server: site1.local, request: “GET /socket.io/?EIO=3&transport=polling&t=M9PI1IG&sid=Hh23QWXltc_JESMiAAAE HTTP/1.1”, upstream: “http://127.0.0.1:9000/socket.io/?EIO=3&transport=polling&t=M9PI1IG&sid=Hh23QWXltc_JESMiAAAE”, host: “t-assistant.tswsp.net”, referrer: “http://t-assistant.tswsp.net/desk
2018/03/24 18:33:17 [error] 4816#4816: *685 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 196.141.64.182, server: site1.local, request: “GET /socket.io/?EIO=3&transport=polling&t=M9PI5kB&sid=N4hCXrdVx_CJOGV2AAAF HTTP/1.1”, upstream: “http://127.0.0.1:9000/socket.io/?EIO=3&transport=polling&t=M9PI5kB&sid=N4hCXrdVx_CJOGV2AAAF”, host: “t-assistant.tswsp.net”, referrer: “http://t-assistant.tswsp.net/desk
2018/03/24 18:48:29 [error] 4816#4816: *900 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 196.141.64.182, server: site1.local, request: “GET /socket.io/?EIO=3&transport=polling&t=M9PLaQl&sid=Ji2KecoBEZmyD_EcAAAI HTTP/1.1”, upstream: “http://127.0.0.1:9000/socket.io/?EIO=3&transport=polling&t=M9PLaQl&sid=Ji2KecoBEZmyD_EcAAAI”, host: “t-assistant.tswsp.net”, referrer: “http://t-assistant.tswsp.net/desk
2018/03/24 18:48:51 [error] 4816#4816: *931 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 196.141.64.182, server: site1.local, request: “GET /socket.io/?EIO=3&transport=polling&t=M9PLfsG&sid=g7KKCUHnIe_nidkRAAAJ HTTP/1.1”, upstream: “http://127.0.0.1:9000/socket.io/?EIO=3&transport=polling&t=M9PLfsG&sid=g7KKCUHnIe_nidkRAAAJ”, host: “t-assistant.tswsp.net”, referrer: “http://t-assistant.tswsp.net/desk

Notice this http://127.0.0.1:9000 - that port may be closed?