bug reported https://bugs.launchpad.net/ubuntu/+source/libcrypto++/+bug/1893934
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Linux newbie here. First time building an ubuntu server to use as a urBackup server and for the life of me I could not figure out why urbackup process would die without warning. I set DEBUG on the log and still it wouldn’t give me a reason, it would just die on "InternetService: No available slots... starting new Worker" but the log would stop there. I narrowed it down to internet clients (closing the port on router made everything work fine for the local clients) but was stuck without a solution.
Thanks to your tip, now everything is working perfectly! Kuddos!
Hello,
I face that same problem.
Do you know why libcrypto++6 new version creates that issue ? Is there any incompatibilty resolution planned ?
Many thanks
Did anyone get this sorted? Mine keeps crashing about 50% of the way through a 140gb backup. It was working fine, but last week it started playing up. I’ve deleted the client, and run a cleanup. That freed up the space. Now I re-added it, but it keeps crashing still part way through. I can’t see anything in the log files either, so I’m not sure what is causing it 
Do you try
wget http://ftp.ca.debian.org/debian/pool/main/libc/libcrypto++/libcrypto++6_5.6.4-9_amd64.deb
sudo dpkg -i libcrypto++6_5.6.4-9_amd64.deb
sudo apt-mark hold libcrypto++6
?
Hello,
The same situation: Ubuntu 20.04.2 - up to date with Urbackup Server 2.4.13.
I can confirm, it’s working, no more crash when client connecting from the internet:
wget http://ftp.br.debian.org/debian/pool/main/libc/libcrypto++/libcrypto++6_5.6.4-8_amd64.deb 2
sudo dpkg -i libcrypto++6_5.6.4-8_amd64.deb
sudo apt-mark hold libcrypto++6
Thanks @ivan
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New installation (My second server) on ProxMox virtual Ubuntu 20.04 and experienced this exact scenario. The downgrade and hold of libcrypto++6 worked for me. 
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I can confirm: Ubuntu 20.04.3 up to date with Urbackup 2.4.15: still crahes after the internet client is conected. The above solution is still working 
sudo apt-mark hold libcrypto++6
This has definitely something to do with CPU as well (apart from libcrypto).
I’m looking after many UrBackup Servers and I had this problem only twice - both times on some old AMD CPU. And both times it started working just after I moved to a different machine with more modern CPU (the same system and configuration).
Still, the docker container still works perfectly. It needs to be some combination of installed libraries as well.
My configuration: Core2Duo E7500, 8GB Memory, 2x2TB HDD with software Raid.
I did an apt upgrade only, after that was a crash.
Did anyone try with a newer Ubuntu (and libcrypto), for example 21.04?