I am sorry for the outage last three days. I was doing upgrade (adding more RAM and two new disks). I completely forgot to announce it and it took as usual more time than I expected. The RAID controller weren't able to add both disks at once and I had to wait till the RAID was reconstructed.
Due to not announcing that I change IP of our development server to the main server's IP so I wrote announce there and BOINC client wrote that the address is not the project's.

So the current server configuration is:
IBM x3550 M4
1x Intel Xeon E5-2620 2.00 GHz
32 (4x8) GB System Memory (1333 MHz)
5x 600 GB IBM SAS 10000 rpm (RAID5)

so far, working again...

keep up the good work...

So the current server configuration is:
IBM x3550 M4
1x Intel Xeon E5-2620 2.00 GHz
32 (4x8) GB System Memory (1333 MHz)
5x 600 GB IBM SAS 10000 rpm (RAID5)

That is a very nice server with plenty of room for expansion.

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BOINC FAQ Service
Official BOINC wiki
Installing BOINC on Linux

Where's the server(s) hosted btw?

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Team AnandTech - SETI@H, Muon1 DPAD, Folding@H, MilkyWay@H, Asteroids@H, LHC@H, POGS, Rosetta@H, Einstein@H,DHPE & CPDN

Main rig - Ryzen 3600, 32GB DDR4 3200, RX 580 8GB, Win10
2nd rig - i7 4930k @4.1 GHz, 16GB DDR3 1866, HD 7870 XT 3GB(DS), Win7

Server is hosted at our university so that I have immediate access to it, if there is a hardware problem.

I added the server configuration to server_status page.