I’m running a nginx server with Nextcloud 15 installed on a Raspberry PI 3b+ (Rasbian OS). Currently I’m trying to synchronise large amounts of files via the windows sync client (with E2E-encryption enabled, client version 2.5.1final). After a couple of files suddenly tons of HTTP/2 protocol errors
appear in the sync client. In the server logs the following error appears:
2019/01/13 12:27:21 [error] 615#615: *41580 connect() to unix:/var/run/php/php7.0-fpm.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: {my IPv6}, server: {my domain}, request: "PUT /remote.php/dav/files/tipe/Pi-Drive/{some filename} HTTP/2.0", upstream: "fastcgi://unix:/var/run/php/php7.0-fpm.sock", host: "{my domain}"
What surprises me the most is that the synchronisation after each restart works for the first couple of files before it breaks.
I narrowed it down to files in folders that use the end-to-end encryption. Additionally I noticed that e2e-encrypted files that are being synced successfully can not be opened with my other clients (even though I did enter the correct mnemonic passphrase)
Any idea where this could come from or how to debug properly?