Web Conference -> Unable to connect to server

• G

  GUILBERT

  4/28/26, 6:51 AM

  Hello, 

  When I log in to webmail, I get a temporary pop-up message that says “Web Conference Unable To Connect To Server”. 
  MDaemon is running the latest version (26.0.1) on a Windows Server 2016.

  Here are the configuration settings, with the local and public IPs defined for the STUN section :

  

  The .pem files are present in the “MDaemon\Pem\_rtcserver” folder :

   

  And finally, here are the logs from the RTCServer-Main.log file :

   

  -----------------------------------------
  ------- Log Started: Tue Apr 28 2026 09:06:38 GMT+0200 (heure d’été d’Europe centrale)
  -----------------------------------------
  2026-04-28 09:06:38 | CRITICAL | MDaemon RTC Server starting...
  2026-04-28 09:06:38 | CRITICAL | loading directories
  2026-04-28 09:06:38 | CRITICAL | Making sure that this is running on the primary node
  2026-04-28 09:06:38 | CRITICAL | Loading config file...
  2026-04-28 09:06:38 | INFO | Loaded existing JWT secret key
  2026-04-28 09:06:38 | CRITICAL | Config loaded
  2026-04-28 09:06:38 | DEBUG | Configuration: {"allowRecording":true,"fileTransfer":{"downloadTokenTtlMinutes":10,"enabled":true,"fileRetentionDays":30,"maxUploadBytes":104857600,"permanentDownloadLinks":false},"logLevel":0,"maxConcurrentRecordings":10,"maxRoomPeers":20,"recordingRetentionDays":30,"signalPort":3443,"stunServer":{"announcedIps":["x.x.x.x","y.y.y.y"],"maxPort":11000,"minPort":10000},"turnServer":{"provider":""},"version":"3.0.3","pemDir":"\\MDaemon\\PEM\\_rtcserver","domain":"mail.mydomain.com","logsDir":"\\MDaemon\\Logs","jwtSecret":"thisismysecrew"}
  2026-04-28 09:06:38 | DEBUG | FileTransferService initialized {"uploadDir":"\\MDaemon\\RTCServer\\data\\uploads","dbPath":"\\MDaemon\\RTCServer\\data\\ConferenceFiles.db3","pendingTokenTtlMs":300000,"downloadTokenTtlMs":600000,"permanentDownloadLinks":false,"fileRetentionMs":2592000000,"cleanupIntervalMs":43200000}
  2026-04-28 09:06:38 | DEBUG | Active rooms file watcher setup failed (file may not exist yet): ENOENT: no such file or directory, watch 'C:\mail\MDaemon\RTCServer\data\active_rooms.json'
  2026-04-28 09:06:38 | DEBUG | File transfer database migrated {"now":1777359998087}
  2026-04-28 09:06:38 | DEBUG | File transfer database ready
  2026-04-28 09:06:38 | DEBUG | Expired file cleanup completed {"removed":0,"total":0,"cutoff":1774767998089}
  2026-04-28 09:06:38 | DEBUG | Initializing servers...
  2026-04-28 09:06:38 | CRITICAL | No valid HTTPS certificate files found. Extracting MDaemon certificate as fallback.
  2026-04-28 09:06:38 | CRITICAL | If you want to use a different certificate, please place the privatekey.pem and publickey.pem files in the \MDaemon\PEM\_rtcserver directory, and restart RTCServer.
  2026-04-28 09:06:38 | INFO | Extracting certificate...
  2026-04-28 09:06:38 | DEBUG | Certificate extraction output: iniFilePath: ..\App\MDaemon.inistore_location: LocalMachinestore_name: Certificate and private key exported as PFX to credentials/certificate.pfxPEM written to .\credentials\publickey_from_pfx.pemPEM written to .\credentials\privatekey_from_pfx.pem
  2026-04-28 09:06:38 | DEBUG | Using extracted certificate files from MDaemon
  2026-04-28 09:06:38 | INFO | STUN Servers initialized
  2026-04-28 09:06:38 | INFO | Getting active rooms to restore
  2026-04-28 09:06:38 | INFO | Signal server running on port 3443
  2026-04-28 09:06:38 | DEBUG | No active rooms found

   

  Thank you in advance for your help

  0 likes 0 likes Liked Like

  ---

  8
  Posts

  54
  Views

  Reply

  ---

• A

  Arron Admin Staff

  4/28/26, 7:59 AM

  For future reference, the RCT server logs contain sensitive data and should not be posted publicly without obfuscating data first.  I obfuscated yours for you before making the post available again, however, you should delete your \MDaemon\pem\_rctserver\jwt-secret.key file and restart MDaemon.  

  After the initial login to webmail, and after you click OK on the pop-up that says unable to connect to server, are you able to open the Web Conferencing window and connect?  or do you get an unable to connect error message?

  Is TCP port 3443 open from the machine you are logging into webmail on to the MDaemon server? 

  What browser are you using?

  If you open the console in your browser (CTRL + SHIFT + I in chrome) and then login to webmail, are there any errors shown in the console?  

   

  --
  Arron Caruth

  0 likes 0 likes Liked Like

  ---

• G

  GUILBERT

  4/28/26, 9:34 AM

  Thanks, Arron, for the reply.

  I did delete the jwt-secret.key file. Then, using the debug console, I saw that there was a timeout on port 3443. So I reviewed our firewall rules, and the web conference is working! And just for your information, in my case, there was no need to specify the IP addresses in the STUN section.

  I have two final questions:

  1) When sending the conference invitation email, the email address from the main domain is used. Is it possible to choose the alias used to send the email? Just as it’s already possible to do when composing an email.

  2) Can you tell me what the minimum and recommended configurations are for the web conference? I noticed that during a test conference, the CPU load increases, especially when the conference is being recorded.

  0 likes 0 likes Liked Like

  ---

• A

  Arron Admin Staff

  4/28/26, 12:51 PM

  there was no need to specify the IP addresses in the STUN section.

  MDaemon will try to figure out what IP addresses to use if you do not specify the STUN server IPs, but its best to always specify them.  If MDaemon can't figure out the IPs to use, it will fall back to using FQDN values, which is better than nothing, but it won't work correctly with Firefox.

  1) When sending the conference invitation email, the email address from the main domain is used. Is it possible to choose the alias used to send the email? Just as it’s already possible to do when composing an email.

  It is not currently possible to use an alias to send the invite.  I'll add a wish list item to be considered for future versions.

  2) Can you tell me what the minimum and recommended configurations are for the web conference? I noticed that during a test conference, the CPU load increases, especially when the conference is being recorded.

  There are no minimum system requirements published, but we know streaming audio and video is very resource intensive, as is recording it. 

  The conference server spawns multiple workers to route audio and video for all calls.  Recording is done by a seperate process, it uses a headless chrome browser that joins the call and actually does the recording.

  The more calls you have active, and the more people on each call, the more resources it requires.  The more calls being recorded, it elevates the requirements even further.  

  We are using a 3rd party component called mediasoup (www.mediasoup.org).  Their documentation does not document system requirements.  

   

   

  --
  Arron Caruth

  0 likes 0 likes Liked Like

  ---

• G

  GUILBERT

  4/29/26, 2:03 AM

  MDaemon will try to figure out what IP addresses to use if you do not specify the STUN server IPs, but its best to always specify them.  If MDaemon can't figure out the IPs to use, it will fall back to using FQDN values, which is better than nothing, but it won't work correctly with Firefox.

  OK, thanks. I've specified them again.

   

  It is not currently possible to use an alias to send the invite.  I'll add a wish list item to be considered for future versions.

  Great, I appreciate that consideration

   

  I also just noticed that with the Pro theme, the mailbox quota displayed at the top isn't showing the correct values. In the example below, the mailbox is using 6,038.9 MB out of the 8,000 MB allocated, but it shows a usage value of 5.90 GB instead of 5.90 TB :

  

   

   

   

  0 likes 0 likes Liked Like

  ---

• A

  Arron Admin Staff

  4/29/26, 7:01 AM

  I also just noticed that with the Pro theme, the mailbox quota displayed at the top isn't showing the correct values. In the example below, the mailbox is using 6,038.9 MB out of the 8,000 MB allocated, but it shows a usage value of 5.90 GB instead of 5.90 TB

  I'm not sure I'm following.  When using a 1024 base, 6,038.9 MB converts to 5.897 GB, which we round up to 5.90 GB.  If we were to convert 6,038.9 MB to TB it would be 0.046 TB.  

  --
  Arron Caruth

  0 likes 0 likes Liked Like

  ---

• G

  GUILBERT

  4/29/26, 7:18 AM

  Sorry, you're right. The conversion is correct. It's just that the Pro theme's display is less clear than the WorldClient theme's

  0 likes 0 likes Liked Like

  ---

• A

  Arron Admin Staff

  4/29/26, 7:28 AM

  Thanks for the feedback!

  --
  Arron Caruth

  0 likes 0 likes Liked Like

  ---