The bibucket-log file has lines similar to:
2018-06-19 09:35:32,729 WARN [ssh-scm-request-handler] 47466e0a4d0d81b7 @162VWKPx575x467093x0 1f0g3a9 130.14.24.88 SSH - git-upload-pack '/xxx/yyy.git' c.a.b.i.ssh.server.SshCommandAdapter Error encountered while handling SSH command 'git-upload-pack '/xxx/yyy.git'': This does not appear to be a git packet stream; packet size was: PACK