Fatal error webdav & encryption

ℹ️ Support
,
1

I find the following errror message in the log:

[webdav] Fatal: OCP\Encryption\Exceptions\GenericEncryptionException: Bad Signature at <>

  1. /www/htdocs/[…]/apps/encryption/lib/Crypto/Crypt.php line 479
    OCA\Encryption\Crypto\Crypt->checkSignature(“q8giwe8bThJaNzm … T”, null, “41e7b403dfb6376 … 9”)
  2. /www/htdocs/[…]/apps/encryption/lib/Crypto/Encryption.php line 376
    OCA\Encryption\Crypto\Crypt->symmetricDecryptFileContent("*** sensitive parameter replaced ", null, “AES-256-CTR”, " sensitive parameter replaced ", " sensitive parameter replaced ***")
  3. /www/htdocs/[…]/lib/private/Files/Stream/Encryption.php line 501
    OCA\Encryption\Crypto\Encryption->decrypt("*** sensitive parameters replaced ***")
  4. /www/htdocs/[…]/lib/private/Files/Stream/Encryption.php line 299
    OC\Files\Stream\Encryption->readCache()
  5. <>
    OC\Files\Stream\Encryption->stream_read(8192)
  6. /www/htdocs/[…]/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php line 91
    fread(null, 8192)
  7. /www/htdocs/[…]/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php line 98
    Icewind\Streams\Wrapper->stream_read(8192)
  8. <>
    Icewind\Streams\CallbackWrapper->stream_read(8192)
  9. /www/htdocs/[…]/3rdparty/sabre/http/lib/Sapi.php line 112
    stream_copy_to_stream(null, null, 694308)
  10. /www/htdocs/[…]/3rdparty/sabre/dav/lib/DAV/Server.php line 492
    Sabre\HTTP\Sapi::sendResponse(Sabre\HTTP\Response {})
  11. /www/htdocs/[…]/3rdparty/sabre/dav/lib/DAV/Server.php line 251
    Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
  12. /www/htdocs/[…]/3rdparty/sabre/dav/lib/DAV/Server.php line 319
    Sabre\DAV\Server->start()
  13. /www/htdocs/[…]/apps/dav/lib/Server.php line 325
    Sabre\DAV\Server->exec()
  14. /www/htdocs/[…]/apps/dav/appinfo/v2/remote.php line 35
    OCA\DAV\Server->exec()
  15. /www/htdocs/[…]/remote.php line 167
    require_once("/www/htdocs/w01 … p")

GET /remote.php/dav/files/USER/DIRECTORY/0194_200811124833_001.pdf
from IP by USER at 2020-10-12T10:22:46+02:00

Nextcloud version: 20.0
Operating system and version: Linux 4.15.0-117-generic x86_64
PHP version: 7.4.10

Any ideas?

Cheers,
Ralph