Error with login

Hello,

I've service desk MSP for 200 user, and since two week, lot of user have a problem for the connection.

The log is flood by :

[15:10:58:290]|[06-08-2015]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[26]|: generateNTLMV2Script HttpServletRequest---> https://servicedesk.victorbuckservices.com/DynamicNotification.do|
[15:10:58:290]|[06-08-2015]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[26]|: lurl--->DynamicNotification.do|
[15:10:58:290]|[06-08-2015]|[com.adventnet.servicedesk.setup.util.SSOUtil]|[INFO]|[26]|: User Or Domain Is Empty inside SSOUtil|
[15:10:58:290]|[06-08-2015]|[com.adventnet.servicedesk.setup.util.LDAPUtil]|[INFO]|[26]|: IsLDAPAuthentication Result : false|
[15:10:59:493]|[06-08-2015]|[SYSOUT]|[INFO]|[23]|: here inside Login.jsp---->|
[15:10:59:493]|[06-08-2015]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[23]|: generateNTLMV2Script HttpServletRequest---> https://servicedesk.victorbuckservices.com/DynamicNotification.do|
[15:10:59:493]|[06-08-2015]|[com.adventnet.servicedesk.authentication.NTLMV2Filter]|[INFO]|[23]|: lurl--->DynamicNotification.do|
[15:10:59:493]|[06-08-2015]|[com.adventnet.servicedesk.setup.util.SSOUtil]|[INFO]|[23]|: User Or Domain Is Empty inside SSOUtil|
[15:10:59:493]|[06-08-2015]|[com.adventnet.servicedesk.setup.util.LDAPUtil]|[INFO]|[23]|: IsLDAPAuthentication Result : false|

Have you a solution?