https://bugzilla.samba.org/show_bug.cgi?id=14713 --- Comment #7 from Steve French <sfrench@xxxxxxxxx> --- There isn't much we can see in the traces you provide except the following: 1) for the "445broken.pcap" wireshark trace we can see that the server hung up the session (probably server bug but hard to prove since the request they hung up on (SMB3 tree connect) is encrypted when you mount with "seal"). If you have access to that system and can reproduce it, it might be helpful to dump the decryption keys so we can see the failing request and make sure it is not malformed. See https://wiki.samba.org/index.php/Wireshark_Decryption for details on how to dump decryption keys 2) for the debug trace you attached all we can see is the "EINVAL" being returned [ 205.645184] CIFS: fs/cifs/connect.c: Received no data or error: 0 [ 205.645187] CIFS: fs/cifs/connect.c: cifs_reconnect: will not do DFS failover: rc = -22 presumably the same issue (the server hung up due to a bug processing the tree connect request (the first encrypted request) when encryption is specified on mount). Could you retry without specifying "seal" on mount and include (or send to my gmail) the wireshark traces? In addition the dynamic trace info may be useful: 1) In one process type "trace-cmd record -e cifs" 2) Run the test in another window 3) dump the dynamic trace info "trace-cmd show" 4) kill the trace from step 1 If it can not be tried without encryption ("seal" on mount) then can you dump the decryption keys for the trace you run (as described in the link above) -- You are receiving this mail because: You are the QA Contact for the bug.