Call timed out (error 1006) - bigbluebutton - nginx

Question

I have installed bigbluebutton on my serverand it was working properly but suddenly microphone can not connect anymore and after a while being stucked in "echo test" i'll get 1006 error and i have tested:
FreeSWITCH fails to bind to IPV4Anchor link for: freeswitch fails to bind to ipv4
In rare occasions after shutdown/restart, the FreeSWITCH database can get corrupted. This will cause FreeSWITCH to have problems binding to IPV4 address (you may see error 1006 when users try to connect).
To check, look in /opt/freeswitch/var/log/freeswitch/freeswitch.log for errors related to loading the database.
2018-10-25 11:05:11.444727 [ERR] switch_core_db.c:108 SQL ERR [unsupported file format]
2018-10-25 11:05:11.444737 [ERR] switch_core_db.c:223 SQL ERR [unsupported file format]
2018-10-25 11:05:11.444759 [NOTICE] sofia.c:5949 Started Profile internal-ipv6 [sofia_reg_internal-ipv6]
2018-10-25 11:05:11.444767 [CRIT] switch_core_sqldb.c:508 Failure to connect to CORE_DB sofia_reg_external!
2018-10-25 11:05:11.444772 [CRIT] sofia.c:3049 Cannot Open SQL Database [external]!
If you see these errors, clear the FreeSWITCH database (BigBlueButton doesn’t use the database and FreeSWITCH will recreate it on startup).
$ sudo systemctl stop freeswitch
$ rm -rf /opt/freeswitch/var/lib/freeswitch/db/*
$ sudo systemctl start freeswitch
but it doesn't solve the problem.
this is output of bbb-conf --check:
BigBlueButton Server 2.2.20 (2037)
Kernel version: 4.4.0-185-generic
Distribution: Ubuntu 16.04.6 LTS (64-bit)
Memory: 4045 MB
CPU cores: 4
/usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties (bbb-web)
bigbluebutton.web.serverURL: https://online.vikipoyan.ir
defaultGuestPolicy: ALWAYS_ACCEPT
svgImagesRequired: true
/etc/nginx/sites-available/bigbluebutton (nginx)
server name: 49.12.60.238
port: 80, [::]:80
port: 443 ssl
bbb-client dir: /var/www/bigbluebutton
/var/www/bigbluebutton/client/conf/config.xml (bbb-client)
Port test (tunnel): rtmp://online.vikipoyan.ir
red5: online.vikipoyan.ir
useWebrtcIfAvailable: true
/opt/freeswitch/etc/freeswitch/vars.xml (FreeSWITCH)
local_ip_v4: 49.12.60.238
external_rtp_ip: stun:stun.freeswitch.org
external_sip_ip: stun:stun.freeswitch.org
/opt/freeswitch/etc/freeswitch/sip_profiles/external.xml (FreeSWITCH)
ext-rtp-ip: $${local_ip_v4}
ext-sip-ip: $${local_ip_v4}
ws-binding: :5066
wss-binding: :7443
/usr/local/bigbluebutton/core/scripts/bigbluebutton.yml (record and playback)
playback_host: online.vikipoyan.ir
playback_protocol: https
ffmpeg: 4.2.2-1bbb1~ubuntu16.04
/etc/bigbluebutton/nginx/sip.nginx (sip.nginx)
proxy_pass: 49.12.60.238
/usr/local/bigbluebutton/bbb-webrtc-sfu/config/default.yml (Kurento SFU)
kurento.ip: 49.12.60.238
kurento.url: ws://127.0.0.1:8888/kurento
kurento.sip_ip: 49.12.60.238
localIpAddress: 49.12.60.238
recordScreenSharing: true
recordWebcams: true
codec_video_main: VP8
codec_video_content: VP8
/usr/share/meteor/bundle/programs/server/assets/app/config/settings.yml (HTML5 client)
build: 968
kurentoUrl: wss://online.vikipoyan.ir/bbb-webrtc-sfu
enableListenOnly: true
# Potential problems described below
# Warning: API URL IPs do not match host:
#
# IP from ifconfig: 49.12.60.238
# /var/lib/tomcat7/demo/bbb_api_conf.jsp: online.vikipoyan.ir
# Warning: The API demos are installed and accessible from:
#
# https://online.vikipoyan.ir
#
# and
#
# https://online.vikipoyan.ir/demo/demo1.jsp
#
# These API demos allow anyone to access your server without authentication
# to create/manage meetings and recordings. They are for testing purposes only.
# If you are running a production system, remove them by running:
#
# apt-get purge bbb-demo
# Warning: You have this server defined for https, but in
#
# /etc/bigbluebutton/nginx/sip.nginx
#
# did not find the use of https in definition for proxy_pass
#
# proxy_pass http://49.12.60.238:5066;
#
# Warning: You have this server defined for https, but in
#
# /etc/bigbluebutton/nginx/sip.nginx
#
# did not find the use of port 7443 in definition for proxy_pass
#
# proxy_pass http://49.12.60.238:5066;
#
I tested everything i found and the problem still exists. is there any way?
Thanks in advance.

Answer 1

run the command:
sudo nano /etc/bigbluebutton/nginx/sip.nginx
something like this will open:
location /ws {
proxy_pass http://49.12.60.238:4066;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
proxy_read_timeout 6h;
proxy_send_timeout 6h;
client_body_timeout 6h;
send_timeout 6h;
}
change the (proxy_pass http://...) line to the following:
proxy_pass https://49.12.60.238:7443;

Answer 2

Please note that I followed the posts at https://github.com/bigbluebutton/bigbluebutton/issues/2628 but didn't get the issue resolved until I ran the following command:
$ wget -qO- https://ubuntu.bigbluebutton.org/bbb-install.sh | bash -s -- -v xenial-22 -s myserver.com -c turn.myserver.com:1004a200000000004cb3f2d6f000d85d -e johndoe#myserver.com -d -g | tee bbb-install.log