JItsi showing black screen when more than 2 participants join

Hello guys,
i have been trying to configure Jitsi on local server and faced the problem stated on the title.

open ports on Firewall
443, 80, range 10000-20000/UDP

i understood that it is a videobridge error because it is not p2p anymore for more than 2 people joining (if i’m not mistaken).

can anyone help me on this?
thanks

Logs so far

jicofo log

Jicofo 2020-04-06 07:25:24.183 INFO: [3559] org.jivesoftware.smack.java7.XmppHostnameVerifier.verify() Certificate does not match hostname

java.security.cert.CertificateException: No subject alternative DNS name matching auth.vc.domain.et found. Tried: *.domain.et

jvb log

2020-04-06 07:30:31.869 INFO: [16] VideobridgeExpireThread.expire#144: Running expire()

2020-04-06 07:30:40.445 INFO: [17] Videobridge.createConference#326: create_conf, id=eda281002b65c45c gid=null logging=false

prosody log

|Apr 06 07:39:28 conference.domain.et:muc_domain_mapper|warn|Session filters applied|
|---|---|---|
|Apr 06 07:39:28 c2s55fed3b78f30|info|Client connected|
|Apr 06 07:39:28 c2s55fed3b78f30|info|Client disconnected: closed|
|Apr 06 07:39:28 mod_bosh|info|Client tried to use sid '5392394e-9288-4412-a689-719b329779f3' which we don't know about|
|Apr 06 07:39:29 mod_bosh|info|Client tried to use sid '5392394e-9288-4412-a689-719b329779f3' which we don't know about|
|Apr 06 07:39:30 mod_bosh|info|Client tried to use sid '5392394e-9288-4412-a689-719b329779f3' which we don't know about|
|Apr 06 07:39:31 mod_bosh|info|Client tried to use sid '5392394e-9288-4412-a689-719b329779f3' which we don't know about|
|Apr 06 07:39:32 mod_bosh|info|Client tried to use sid '5392394e-9288-4412-a689-719b329779f3' which we don't know about|

You only need 10000 UDP, not that full range.

Have you followed the advanced instructions here?

yes, this is how i installed

what do you think is the reason for it not to work

  1. outside LAN
  2. More than 2 participants