MIIB123 Posted yesterday at 17:10 Share Posted yesterday at 17:10 Hello everyone My friend, who plays this game with us online, has had an issue since the latest release (28). When she tries to log into the lobby she receives the error: "The server's certificate could not be verified or the TLS handshake did not complete successfully." Details: No new software (antivirus, firewall, etc.) was installed before the problem; the computer is considered clean. TLS encryption is enabled. Her username and other account details are unchanged. No settings were changed in the game or in Windows. Internet connection is stable with low ping. She connects via mobile data using a SIM card and modem. We were playing normally for weeks on this release and also on older releases before the issue started. Picture of error Please advise if there is a solution. We really enjoy the game and want to keep playing. Thank you! Quote Link to comment Share on other sites More sharing options...
Stan` Posted yesterday at 19:59 Share Posted yesterday at 19:59 He needs to enable TLS in the game options Quote Link to comment Share on other sites More sharing options...
MIIB123 Posted yesterday at 20:00 Author Share Posted yesterday at 20:00 I know, she did, and the result is this message I think this issue is more complex... Quote Link to comment Share on other sites More sharing options...
Stan` Posted yesterday at 20:03 Share Posted yesterday at 20:03 Oh my bad, answered too quickly; That's strange. What version of Windows is she on? cc @Dunedan Quote Link to comment Share on other sites More sharing options...
MIIB123 Posted yesterday at 20:06 Author Share Posted yesterday at 20:06 Windows 11, same as me. Same game version, stable connection, clean computer, etc... It works over hamachi but connection is not stable (she drops of server occasionally). Through lobby it worked perfectly. Quote Link to comment Share on other sites More sharing options...
Stan` Posted 21 hours ago Share Posted 21 hours ago Did it start happening then ? Quote Link to comment Share on other sites More sharing options...
Dunedan Posted 20 hours ago Share Posted 20 hours ago What's the version of 0ad she's using? Are you 100% sure it's r28? Can you confirm that it worked with the same internet connection before? What's the name of the internet service provider? If you can test, does it work when using another internet service provider? When running "certmgr.msc" and selecting "Trusted Root Certification Authorities" -> "Certificates" in the left pane, does the list of certificates contain one or more containing "ISRG"? Quote Link to comment Share on other sites More sharing options...
MIIB123 Posted 2 hours ago Author Share Posted 2 hours ago Thank you for all replies: - version of game: Feb 16, 2026 (release-0-28.0, a2cae) - It worked before with the same connection but just few times (provider was changed 1 week prior to issue) - Name of provider: T-mobile Austria - Tested with another provider (A1), same issue - There is just one ISRG (ISRG Root X1) - Latest windows updates performed I hope this information helps. Quote Link to comment Share on other sites More sharing options...
Dunedan Posted 1 hour ago Share Posted 1 hour ago That's definitely interesting and the first time somebody reported this problem. Can you please send me a private message with the lobby username of your friend so I can have a look if we got something in the logs for these connection attempts? Quote Link to comment Share on other sites More sharing options...
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