Authorization errors

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Authorization errors

OFFLINE mode / "Cannot exit offline mode due to hardware ID change"

With DCS World 2.5.1 we have implemented new OFFLINE mode.

To transfer DCS to OFFLINE mode, click on the antenna button in the top panel of the main menu. This can be done ONLY after successful authorization. You cannot enable OFFLINE mode unless you have an internet connection first.

User can turn on OFFLINE mode that allows the game to be used without internet identification and without a time limit.
If you don't want to play Multiplayer game, no need to enable OFFLINE mode.

Note: user must turn off OFFLINE mode on the same PC*. OFFLINE mode cannot be turned off from another PC even with the same user's login.
* on the same PC - it means exactly the same for both hardware and software. For example, changing BIOS or reinstalling Windows in offline mode will not allow you to log in.

The mode is unlimited in time, thus all network services (Manager of Modules, multiplayer, news) will be inaccessible.

More information you can find on forums:

If you get an error code 409 that means you are no longer able to play DCS.
Also you can't enable or disable OFFLINE mode.

You need to Create a support ticket

ERROR: Couldn't resolve host name

When you try to use DCS updater to repair or update, it can not connect to server and you get an error saying couldn't resolve host name.

from log file - autoupdate_log.txt - located in root DCS World folder you can see:
ERROR: replied HTTP -1 
ERROR: Couldn't resolve host name

to resolve this issue you can try some hints:

  • try to Completely disable AV and Firewall and try again
  • try to manually change DNS server for IPv4 to free DNS from Google
  • try to flush DNS via the command prompt - ipconfig /flushdns (
  • try to do a WINSOCK reset via the command prompt - netsh winsock reset

"No internet connection"

Something is blocking DCS World access to the Internet.

Please double check that your antivirus and firewall is allowing DCS World to access the network (ports 80, 443).

BitDefender owners:

This program has so many options, it has an SSL analyze which should be turned off for DCS World to work.
1. Goto Menu / Protection /Protection WEB / Analyse SSL
2. Turn it off

Also add DCS world exe file to Exceptions
1. Go to Adjustments / Antivirus-Adjustments / Exceptions.
2. Add DCS.exe file.

If nothing helps the only way is complete uninstall of the BitDefender.

Kaspersky Internet Security owners:

1. Go to Settings / Protection / Application control settings / Manage application
2. Find all executable files in the DCS World folder: 
DCS World\Run.exe
DCS World\bin\DCS.exe
DCS World\bin\DCS_updater.exe
DCS World\bin\dcs_protect.exe

3. Right click on it and choose "Details and rules".
4. Select checkbox in exclusions.

ESET Smart Security 8 owners:

1. Go to Advanced Setup / Protocol Filtering - SSL.
2. Disable SSL protocol scanning.
3. Go to Web access protection - HTTP, HTTPS.
4. Check Do not use HTTPs protocol checking.

"SSL peer certificate or SSH remote key not OK"

Your antivirus software is blocking DCS World access to the Internet.

Find more in the faq article above

"Incorrect login name or password"

You supplied incorrect login name or password. Please check them again. You can try to authorize on the DCS site or use password recovery form.

"Invalid serial number"

This error means that some of your serial numbers activated in the game are bound to another login or not bound to account or blacklisted.

You have to check the serial number bindings written under the error message "invalid serial number"
You can copy serial numbers in red and check them on Licensing page.

Also these wrong keys can be found in the dcs.log file here  C:\Users\YOUR_NAME\Saved Games\DCS [open beta]\Logs\
You need to open it and find the strings :
ERROR NET: Login failed because of a serial number conflict.
ERROR NET: "number" keys were rejected:
copy and paste the keys at special Licensing page:

License Management Page FAQ:

If some of your serial numbers are bound to other Login (username) you have to write us via user support system and describe your issue with posted Invalid serial numbers in message.

* * * * * *

Also we can transfer All your orders and serials from unused account to Main one.
In this case you should create a new ticket here :
please choose the proper category - Binding of the serial numbers (as a gift, combine accounts,...)
and write us information about your accounts and which account you want to use as Main.

"Invalid Serial Number" and it's Blacklisted and Deactivated

If you've checked your serial number on the licensing page
and found that your serial number is blacklisted and deactivated.

Your serial number has been Blacklisted because Steam every month sends us a list of revoked keys and all the keys from this list are blocked and deactivated.

If you disagree with that and your serial number still in Steam Library, then:

Create a new support ticket and choose the category: Serial number activation issues > Deactivated / Blacklisted serial number

We need a proof that your CD key has not been revoked.

You have to send us a screenshot of your DCS CD keys from Steam Library.
Where to get Steam CD key?

and screenshot of your orders

Kindly attach a copy of your receipt.

"Invalid Serial Number" after refund a module via Steam

If a DCS module (DLC) was refunded (returned) via Steam and you want to fix "Invalid Serial Number" error, then:

you have to download and run reg fix for affected module from Activation FAQ.
Then delete the module from DCS via Module Manager
After that start DCS World and play without errors.

"Invalid Serial Number" but you have purchased the same module again

If you purchased again a new serial number for the same module that has been revoked (refunded) previously, 
but your Old key is still in the Windows registry and you continually get an error - Invalid serial number, 
         and You can not log into game account due to this key
you have to delete this old key using the reg fix files - Problem with Activation

Unable to bind DCS World Key purchased from other sources

Only DCS World keys purchased from the DCS World E-shop and Steam are valid and can be bound to account and activated in the Module Manager.
Any DCS World keys purchased from other sources are invalid and are simply trying to re-sell keys that are bound to other users.
Such sites include Kinguin and CDExpress. 

If you purchase such invalid DCS World keys from these sites, we cannot help you. We suggest you contact these sites for a refund.