Good day Boinc community

I have a problem with my Boinc Manager.

Boinc worked perfectly for years, and suddenly after opening the manager, boinc says:''Unable to connect to the core client''.
I tried to contact 11 (!) people over skype, but no one answers...

I have windows 10, I tried to uninstal Boinc and virtual box and to install it (and tried it with some older versions of the manager too), i set new rules in the firewall for these programs (boinc.exe, boincmgr.exe) and also a special rule for the port 31416, but nothing happens.

Thanks for help

---

My boinc version is 7.10.2

We may need to go through multiple steps here. First, we need to be certain that the BOINC Client (the normally-silent working part of BOINC) is actually running: it is normally started automatically by BOINC Manager.

Open the Windows Task Manager - the easiest way is to right-click on the task bar across the bottom of your screen - and look at the 'processes' tab.

You should see two separate entries:

boinc.exe (described as 'BOINC client')
boincmgr.exe (described as 'BOINC Manager for Windows')

If the Manager is listed, but the client is not, then the client may have crashed, and we'll have to go searching for evidence. But let us know what you see first.

Thanks for quick help!

boincmgr.exe and boinctray.exe are running

Thanks for quick help!

boincmgr.exe and boinctray.exe are running

By which, I assume that boinc.exe isn't?

First quick check:
Open BOINC Manager
Switch to 'Advanced' view, if you're not using that already
From the 'Options' menu, select 'Other options..."
See whether 'Run the client?' is checked. It should be.
If it wasn't, check it and try again.

If still no joy, open Windows Explorer (the file management tool).
Navigate to

C:\Users\[YourLoginName]\AppData\Roaming\BOINC

Look for the file

stderrdae.txt

Let us know whether it exists, how big it is, and when it was last datestamped.

If it does exist, open it, and look for the last (most recent) occurrence of

BOINC Windows Runtime Debugger Version xxx

Dump Timestamp    : xx/xx/xx yy:yy:yy

- that should be today.

Below that, look for "*** Dump of thread ID...". Copy from there to the end, and post it here.

By the way, an easier way to get there is by inputting %APPDATA%/BOINC into search an hitting Enter. :)

[quote]Thanks for quick help!

boincmgr.exe and boinctray.exe are running

By which, I assume that boinc.exe isn't?

First quick check:
Open BOINC Manager
Switch to 'Advanced' view, if you're not using that already
From the 'Options' menu, select 'Other options..."
See whether 'Run the client?' is checked. It should be.
If it wasn't, check it and try again.

Thank you so much, it works!
It feels like I am dumb because i didn't tried it before... but I heard this solution the first time.

the question is, why did it ''unchecked'' it itself?