[Samba] tons of "auth in progress" in samba file server

[Adam Xu]

Hi everyone,

My samba file server has been running for more than 1 year, but 
recently, there are a lot of errors coming up.

when I run "smbstatus -b", tons of "auth in progress" appears. like:

27424   (auth in progress)        192.168.60.212 
(ipv4:192.168.60.212:50579) SMB3_11           - -
11513   (auth in progress)        192.168.60.25 
(ipv4:192.168.60.25:60700)  SMB3_11           - -
19988   (auth in progress)        192.168.60.180 
(ipv4:192.168.60.180:50989) SMB3_11           - -
19173   (auth in progress)        192.168.61.122 
(ipv4:192.168.61.122:57649) SMB3_11           - -
14340   (auth in progress)        192.168.60.228 
(ipv4:192.168.60.228:58389) SMB3_11           - -
12586   (auth in progress)        192.168.61.133 
(ipv4:192.168.61.133:53553) SMB3_11           - -
15450   (auth in progress)        192.168.60.16 
(ipv4:192.168.60.16:56589)  SMB3_11           - -
11340   (auth in progress)        192.168.60.236 
(ipv4:192.168.60.236:63931) SMB3_11           - -
11408   (auth in progress)        192.168.60.176 
(ipv4:192.168.60.176:58473) SMB3_11           - -
11408   (auth in progress)        192.168.60.176 
(ipv4:192.168.60.176:58473) SMB3_11           - -
19988   (auth in progress)        192.168.60.180 
(ipv4:192.168.60.180:50989) SMB3_11           - -
19988   (auth in progress)        192.168.60.180 
(ipv4:192.168.60.180:50989) SMB3_11           - -
11672   (auth in progress)        192.168.60.63 
(ipv4:192.168.60.63:63335)  SMB3_11           - -

and

[root at centos ~]# smbstatus -b | wc -l
3971

My OS is CenOS 7.9 and samba version is 4.10.16.

My smb.conf is:

[global]
         security = ADS
         workgroup = NTBAOBEI
         realm = NTBAOBEI.COM

         log file = /var/log/samba/%m.log
         log level = 3 passdb:5 auth:5 winbind:5

         idmap config * : backend = tdb
         idmap config * : range = 3000-7999
         idmap config NTBAOBEI:backend = ad
         idmap config NTBAOBEI:schema_mode = rfc2307
         idmap config NTBAOBEI:range = 10000-999999
         idmap config NTBAOBEI:unix_nss_info = yes

         winbind use default domain = Yes
         winbind offline logon = yes
         winbind refresh tickets = yes
         access based share enum = yes
         hide unreadable = yes

         winbind max clients = 600

         load printers = no
         vfs objects = acl_xattr full_audit recycle
         map acl inherit = yes
         store dos attributes = yes

[shareA]
         path = /srv/samba/A/
         read only = no

[shareB]
         path = /srv/samba/B/
         read only = no

......

This situation has only recently appeared. Have you encountered this 
problem and how to solve it?