Cannot resolve IP address

[almor]

Some times for some PC in the our network i've got the error:
Cannot resolve IP address
We use a static IPs with out a DNS server. I've already added the IP of those PC in the hosts file of my Lansweeper server.

I already checked the Lansweeper troubleshooting guide and DNS guide
Device tester test passed with out any erors:

Pinging JOSKIN_0084
	Ping ok.

Scanning TCP ports..
	135 open (EPMAP)
	139 open (NetBIOS Session Service)
	445 open (SMB)

Checking DNS..
	DNS resolved to: 192.168.107.45
	If this is not correct, please check for DNS problems.

Scanning netbios (UDP)..
	Computername: JOSKIN_0084
	Domain: POLSKA

Scanning WMI..
	Computername: JOSKIN_0084
	If this is not correct, please check for DNS problems

	Operating system: Microsoft Windows XP ProfessionnelService Pack 3
	\root\cimv2 Remote WMI access test OK

	Operating system: Microsoft Windows XP Service Pack 3
	\root\default Remote WMI access test OK
Done.

manually launched "Rescan Asset" solve the problem, but until a next Lansweeper's IP rescan

Lansweeper version v.5052, but this issue was in previous(5.*) versions too

[almor]

Sorry, i think it was my fault.
I forget to update Lsclient.exe, used on the Windows logon.
It was a version 4.0.*
Changed it to the last one solved(i hope, during last 2 days all is ok) my problem.

[Hemoco]

Please contact us at support@lansweeper.com and provide us with:
- A link to this forum thread.
- Screenshot of JOSKIN_0084's Lansweeper webpage when this issue occurs. Show us the Errors and Scan Time tab of the page.