The Backend Error 1127 is typically encountered when PC users attempt to launch Vermintide 2 conventionally. This problem is not exclusive to a certain windows version as the problem has been confirmed on Windows 7, Windows 8.1, and Windows 10.
As it turns out, there are several different causes that are known to cause this particular issue on PC:
- Common Steam inconsistency – One of the most common causes that will produce this error is a fairly common Steam inconsistency. The majority of affected users have reported that the problem was fixed after they restarted Steam conventionally and booted up the game once again.
- Server issues with Steam or Vermintide 2 – It’s also possible that you’re facing this problem while Steam is going through an outage period or if you’re attempting to play while FatShark (game developer) is in the middle of a maintenance period or trying to fix a server problem. In this case, there is no other fix other than waiting for the involved parties to fix the problem.
- Inconsistent Domain Name Address – If you’re using a tier 2 ISP provider and you’re having network issues with other games as well, chances are you’re actually dealing with an inconsistent DNS. If this scenario is applicable, you should be able to fix this problem by making the switch from your default DNS to the DNS provided by Google.
- Server IP range is blocked by the government – If you’re trying to play the game from Russia or Eastern European countries, it’s possible that fixed IP the game server is using is actually blocked at a government level. In this case, you should be able to fix the problem by using a VPN client to circumvent the restriction.
- Corrupted Game files – According to some affected users, this problem can also occur due to some type of inconsistency related to the game files that are stored locally. If you’re launching the game through Steam, you should be able to fix the problem by doing an integrity check on the game files.
Method 1: Restarting Steam
If you’re launching the game through Steam, you should start this troubleshooting guide by restarting the game launcher. This workaround has been confirmed to be effective by a lot of affected users that were previously struggling to host or join online sessions.
But keep in mind that you’ll need to make sure that you close the Steam background service completely by right-clicking on their Steam icons and clicking on Exit from the newly appeared context menu.
After you do this, open Steam again and launch Vermintide 2 from the Library tab to see if the problem is now resolved.
In case you are still seeing the same Backend Error 1127, move down to the next potential fix below.
Method 2: Checking for Server Problems
If a simple restart didn’t work for you, you should proceed by checking whether Steam is currently experiencing any server issues that might end up causing this particular error code. If that’s not the cause of the problem, you should proceed by investigating whether the game servers are affected instead.
You should start by verifying the current status of Steam. One of the best 3rd party websites that will allow you to do this is SteamStat.us. Once you arrive on the correct page, check whether the Steam server in your area is currently experiencing any issues that might cause Vermintide 2 and other games in your library to malfunction.
If the investigations you just performed didn’t reveal any underlying server issues with Steam, you should proceed by doing a check on the dedicated mega servers of Vermintide 2.
To check whether the developers are currently dealing with any problems, you should check the Twitter account of Vermintide 2 and consult the FatShark forums to see if there are any sticky posts on technical issues the devs are currently working to resolve.
In case the investigations you’ve just performed didn’t reveal any underlying server problems, move down to the next potential fix below.
Method 3: Switching to Google DNS
If a simple restart didn’t work and you have successfully confirmed that neither Steam or Fatshark are currently dealing with server issues, you might want to consider that you might be dealing with a DNS (Domain Name System) error.
If you’re using a tier 2 IPS, you might get assigned a bad DNS range that the game server rejects. If this scenario is applicable, you should be able to fix the problem by making the switch to the DNS provided by Google. This fix was confirmed to be effective by several different affected users.
If you want to deploy this fix, follow the instructions below to make the switch to the DNS provided by Google:
- Press Windows key + R to open up a Run dialog box. Next, type ‘ncpa.cpl’ and press Enter to open up the Network Connections menu.
- Once you’re inside the Network Connections menu, right-click on the network that you’re currently connected to, then right-click on Wi-Fi (Wireless Connection) or Ethernet (Local Area Connection) depending on the type of connection you’re using, then click on Properties from the newly appeared context menu.
- From the Properties screen of your network connection, select the Networking tab, then go to the This connection uses the following items module, select Internet Protocol Version 4 (TCP / IPv4) and click on the Properties menu below.
- Once you get to the next menu, select the General tab, then check the google associated with Use the following DNS server address and replace Prefference DNS server and Alternate DNS server with the following values:
- Once you manage to modify the values accordingly, follow step 3 and 4 again to do the same thing for Internet Protocol Version 6 (TCP / IPv6) to Google DNS:
- Save the changes that you’ve just enforced, then restart your computer and see if the problem is now resolved.
After you made the switch to Google’s DNS, launch the game once again and see if you still see the Backend Error: 1127 when you try to connect to a server or create one.
If the same problem is still occurring, move down to the next potential fix below.
Method 4: Using a VPN to circumvent Government Restrictions (if applicable)
Keep in mind that the Vermintide 2 is one of those games that are designed to make fixed level IPs whenever 2 players try to initiate co-op. This is fine in most countries, but the particular IP range that the game uses is blocked by certain governments.
In most cases, this issue is reported with Russia and other Eastern European countries in this area.
If this scenario is applicable, the only thing you can do to circumvent the Backend Error: 1127 is to filter your connection via a VPN network. Generally, system-level VPNs are known to serve this purpose better than proxy servers.
Here are a few VPN services that include a free version that you can use in order to circumvent government-imposed government restrictions in your countries:
- Express VPN
- Hide.Me VPN
Install the VPN solution of your choosing, then filter your connection through a country without this type of fixed IP restriction (United Kingdon, USA, Germany, France, etc.) and see if you are able to play co-op sessions in Vermintide without encountering the same error code.
In case the same problem is still occurring, move down to the next potential fix below.
Method 5: Verifying Vermintide 2 Integrity through Steam
As it turns, this particular issue can also occur due to some kind of inconsistency facilitated by corruption among the game files belonging to Vermintide 2. Several affected users encountering the same problem have managed to fix the problem by using the built-in integrity check feature of Steam to repair or add the corrupted game files.
If you think this scenario is applicable, follow the instructions below to initiate an integrity check on Vermintide 2 via Steam:
- Ensure that Vermintide 2 is completely closed, then open Steam and access the library tab from the menu at the top.
- Next, use the menu on the left to right-click on Vermintide 2 and then click on Properties from the context menu.
- Inside the Properties screen of Vermintide 2, click on the Local Files tab, then click on Verify Integrity of the game files from the list of available options.
- Confirm at the final prompt, then wait for the operation to complete.
- Once the scan is complete, restart your computer and see if the problem is now resolved by launching the game after the next startup and seeing if the Backend Error: 1127 error is still occurring.