Solaris 11.4 has recently been released with support for SMBv3 and SMB encryption and I have tried testing connectivity between a CentOS 7 VM (with latest update: 3.10.0-862.11.6.el7.x86_64) and a Solaris 11.4 fileserver.
Connecting using SMBv2 works fine, for instance:
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//myserver/myshare /mnt/myshare cifs nounix,noserverino,ro,_netdev,nosuid,perm,nodev,noexec,cache=strict,sec=ntlmssp,vers=2.1,context="system_u:object_r:my_content_t:s0",credentials=/root/creds_smb_library_core,port=445,forceuid,forcegid,file_mode=0444,dir_mode=0555,uid=5000,gid=6000 0 0
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Sep 2 05:17:34 starscream kernel: CIFS VFS: cifs_mount failed w/return code = -11
Sep 2 05:17:34 starscream kernel: CIFS VFS: cifs_mount failed w/return code = -11
Sep 2 05:17:35 starscream kernel: CIFS VFS: cifs_mount failed w/return code = -11
Sep 2 05:17:35 starscream kernel: CIFS VFS: cifs_mount failed w/return code = -11
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server_lmauth_level=5
oplock_enable=true
server_signing_enabled=true
server_signing_required=false
server_encrypt_data=true
server_reject_unencrypt=false
server_minprotocol=2
server_maxprotocol=3
restrict_anonymous=true
Regards,
Achelon