Memory Calculation Failure

Summary

When trying to push a memory calculation, all other Publishing Validation checks succeed, but memory calculation never succeeds, with no warning to the output log. In the memory calculation tab, it shows ‘Error | Calcluation failed; see output log’ but in the output log there is nothing pointing to a failure.

There was a similar report with 43.00, but it was closed. This issue is still persisting with 43.10, but we did not have this issue with 43.00.

We have tried to run it on multiple different computers, launched session on PC and mobile, and redownloaded the entire project and nothing has worked.

We did find a work around that changing to the following settings would load the memory calculation correctly, but it is not preferred.
World Settings:

Partition Cell size Loading range
MainPartition 3,200 cm 19,200 cm
HLOD partition 6,400 cm 19,200 cm

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Publishing

Steps to Reproduce

  1. Go to Project > Launch Memory Calculation
  2. Fortnite correctly launches a session and ends the session.
  3. Publishing report shows everything else reporting correctly, but the memory calculation fails.

Alternatively, launching a session, ending a session and then launching a memory calculation still fails.

Expected Result

Map should generate a memory calculation or if there is an error, show in the output log correctly when mentioned.

Observed Result

There is no message in the output log when it fails.

Platform(s)

PC

Island Code

8402-7861-9119

Upload an image

UnrealEditorFortnite.log (8.59 MB)FNLogs.zip (4.64 MB)UEFNLogs.zip (2.41 MB)

Additional Notes

Logs show two different branches trying mem calcs for uefn, both failing at the following cell sizes, but but succeeding at the work arounds cell size.

Partition Cell size Loading range
MainPartition 1,600 cm 19,200 cm
HLOD partition 3,200 cm 19,200 cm

hi @vageuly

Please can you read and try my post in

[Critical] Memory calculation fails after 43.00 - General / Issues and Bug Reporting - Epic Developer Community Forums

The method appears to have changed

We tried this as well after seeing your post there and it didn’t work for us either.

HI @vageuly

The errors are from the EOSSDK which is part of Epic Games Launcher needs to be unistalled

Epic Games Launcher will reload automatically

[2026.11.14-04.46.07:600][591]LogEOSSDK: LogEOSAuth: Verify access token started. LocalUserId=82a...24a
[2026.11.14-04.46.10:267][599]LogEOSSDK: LogEOSAuth: Verify access token succeeded. LocalUserId=82a...24a
[2026.11.14-04.46.27:924][652]LogNet: UIpConnection::HandleSocketSendResult: Socket->SendTo failed with error 10 (SE_ENOTSOCK). [UNetConnection] RemoteAddr: 3.237.148.133:15012, Name: IpConnection_0, Driver: Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0, IsServer: NO, PC: NULL, Owner: ValkyrieBeaconClient_0, UniqueId: 

[2026.11.14-04.50.59:267][466]LogEOSSDK: Warning: LogHttp: 000001656E9B2A00: libcurl info message cache 0 (URL rejected: No host part in the URL)
[2026.11.14-04.50.59:267][466]LogEOSSDK: Warning: LogHttp: 000001656E9B2A00: libcurl info message cache 1 (Closing connection)
[2026.11.14-04.50.59:600][467]LogEOSSDK: Warning: LogHttp: Retry exhausted on /api/lease/67731b3b183e4efabf9597f04b38ddf9?scope=game
[2026.11.14-04.50.59:600][467]LogEOSSDK: Warning: LogEOS: Failed to connect to the backend. ServiceName=[PlayerLease], OperationName=[Createlease], Url=[<Redacted>]

[2026.11.14-04.51.37:600][581]LogEOSSDK: LogEOS: ScheduleNextSDKConfigDataUpdate - Time: 4802.713867,

 Update Interval: 314.447449_auth_token_refreshed] Cached OSSv2 auth token (1686 chars).

```
This EOSSDK needs to be remove using Windows Uninstall