Win 7 system time is not symchronised with local time

After upgrading a TPLink wireless router to an Asus RT N66U router, all our various machines see each other and show file data in Home Group except for the Acer 4220 laptop.

I can see the 4220 in the Home Group BUT I can not access file date from the main machine.  From the 4220, I can access file data on my main machine, so it works ok in that direction. But, not other machines.

When using the Home Group problems shooter, it says that the 4220's system clock and local time are not synchronised. When I ask it to fix the problem, it says it can not make that fix.

After trying many solutions I found in a Google search which do not work, I tried a manual time sync using the time on my main machine - after many attempts it is not possible to press a key quick enough sync to the millisecond :)

I tried to sync the 4220 to the Atomic Clock in Colorado using AtomClock utility - when applying it says it is not able to adjust the system clock.

Some solutions suggest it is an out of date BIOS. The 4220 is 2.5 yrs old.

File exchange was fine before I installed the Asus router - which has excellent user feedback.

After the Asus router install, I had to run netsh winsock reset and IPV6 and 4 interface reset to get any homegroup machines to appear on any machine.

All other machines can file exchange, just the 4220 can not from it to another machine

Any suggestions, pleeeeease.

Rgds Jonathan
nextensoAsked:
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cwstad2Commented:
check with this app. Port 123 is NTP is network time protocol

http://www.microsoft.com/en-us/download/details.aspx?id=24009
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cwstad2Commented:
Check if UDP 123 is listening
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nextensoAuthor Commented:
Sorry, have good knowledge, patchy, but, not expert. In which direction, from 4220 to my main machine or other way around

I should have noted I can ping the main machine from the 4220 ok, and the other way around.

Rgds
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nextensoAuthor Commented:
I just installed Attacker to check port listening
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nextensoAuthor Commented:
On both machines, a manual port query as UPD on Port 123 says that Port 123 (ntp service) is not listening with this result on both machines

UDP port 123 (ntp service): NOT LISTENING
portqry.exe -n 127.0.0.1 -e 123 -p UDP exits with return code 0x00000001.
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cwstad2Commented:
thats more than likely your problem. if you have a firewall check that port isnt being blocked
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nextensoAuthor Commented:
Thanks for your prompt relies. I turned off firewall in router and the Avast firewall that was running before. I have Windows firewall off anyway to stop conflict.

UDP still not listening

So, if not a firewall issue ?????
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cwstad2Commented:
is there a 3rd part app causing the issue?
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nextensoAuthor Commented:
No app added after or a week before this problem. It started with installing the Asus wireless router.

I just checked an article for Avast about open ports in a firewall, it says that ICS mode should be on in Windows, if enabled in Avast. Maybe Avast of Windows responded to the seeing the Asus router and disabled ICS.

But surely in setting up the HomeGroup again and allowing file, printer and images etc sharing, ICS would be enabled automatically.
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nextensoAuthor Commented:
Ah, on checking the 'Sharing' tab in the network connection properties, the "Allow other users to share....." had become unticked
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cwstad2Commented:
check that and see what happens
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nextensoAuthor Commented:
123 is now listening :) and I can access files :) thank you for pointing me in right direction
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cwstad2Commented:
glad to be of help
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cwstad2Commented:
please dont forget forget to score if the solution was of help
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