This problem started to appear to me while using Du network in the United Arab Emirates, Dubai, since June 2023; du simply blocked either the ports or the updater app, and my autoupdate_log show the following:
00000.089 --- Log file: D:\Program Files\Eagle Dynamics\DCS World OpenBeta\autoupdate_log.txt
00000.000 === Log opened UTC 2024-06-09 09:52:31
00000.027 INFO : DCS_Updater/2.16.3.18 (Windows NT 10.0.22631; Win64; en-AE)
00000.027 INFO : src-id: f697eb0b6959f621dddfde672932cdb00d183f23, lib-id: b88ea51ae2210987a3865f77cc1802548216d7a8
00000.028 INFO : cmdline: "D:\Program Files\Eagle Dynamics\DCS World OpenBeta\bin\DCS_updater.exe" apply df21c450-63d9-4e27-8740-8d918670d166 27220
00000.064 STATUS: Initializing...
00000.087 INFO : basedir: D:\Program Files\Eagle Dynamics\DCS World OpenBeta\
00000.088 INFO : variant: openbeta
00000.089 INFO : Command: update 2.9.5.55918
00000.090 INFO : DCS/2.9.4.53990 (x86_64; EN; WORLD,AH-64D,POLYCHOPSIM_SA342,KA-50_3,KA-50,UH-1H,SPITFIRE-MKIX,P-51D,F-16C,FC3,A-10C,DEKA_JF-17,SU-33,MIG-21BIS,RAZBAM_AV8BNA,AVIODEV_C-101,FA-18C,F-5E,A-10C_2,HEATBLUR_F-14,FALKLANDS_terrain,NEVADA_terrain,SYRIA_terrain,NORMANDY_terrain,MARIANAISLANDS_terrain,THECHANNEL_terrain,PERSIANGULF_terrain,SU27-ULTIMATE_campaign,SUPERCARRIER,WWII-ARMOUR,CA,CAUCASUS_terrain,FW-190A8,SINAIMAP_terrain,RAZBAM_F-15E)
00000.090 INFO : branch: openbeta
00000.090 STATUS: Downloading version info...
00000.145 ERROR: Conection to server 'cdn.digitalcombatsimulator.com' failed: Couldn't resolve host name
00000.145 STATUS: Servers are unable to complete your request. Please, try again later.
For me to proceed, I need to know the updater server IP and ports used. And whoever says to use VPN, VPS are blocked and illegal in Dubai unless in hotels.