Hello,
I have workunits that are stuck, never sent back to the server, Boinc Manager is showing a "LODA | Scheduler request failed: HTTP internal server error"
The system is still able to get new workunits.
Host

We can see that the last contact is from couple of hours ago now.

Other systems I have currently do not have this issue.

Any idea?

Can you try "Update Project" in the BOINC Manager?

That is what I already tried: then it wants to report ~2515 WU, then shows up the error.

I hope I will get a solution, because already loosing dozens of WU per day (no response, then WU cancelled from the server!)

That is what I already tried: then it wants to report ~2515 WU, then shows up the error.

I hope I will get a solution, because already loosing dozens of WU per day (no response, then WU cancelled from the server!)

You are trying to upload way too many files/tasks at once. BOINC can usually handle Aprox 100 simultaneous transfer / connections per computer.

Do you have
<report_results_immediately>1
</report_results_immediately>
in your cc_config.xml? File is located in the BOINCdata folder.

Solution: Go to transfer tab and select 100 files to manually retry, rinse repeatedly until all have transferred.
If BOINC still has errors with transferring of 100 files at once, drop off 10 files [90, 80, 70] until no errors occur, rinse repeatedly until all have transferred.

---

Nothing in Transfer tab, I removed that report immediately option (+ restarted boinc service), but all WU's try to be validated at the same time.

Issue solved by using that in cc_config.xml:

<max_tasks_reported>500</max_tasks_reported>

Source

Thanks all (especially [AF>Libristes] erik)