WiFi Issues now occuring in SBS 2011 environment

Hi Guys,

A few weeks ago we started experiencing an issue where some users couldn't get internet access in the office on the WiFi but others can with no problem. The devices could be from an iPhone, android tablet and even Windows 10 laptops - the weird thing is they will all connect to the WiFi but get the message No Internet, secured. I have even tried a different router and the same thing happens.
DHCP addresses and DNS are from an SBS 2011 server so I am wondering that maybe an update has done something on there but am at a loss where to look because as I say its only certain devices that wont connect.

Any thoughts would be greatly appreciated.
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JohnBusiness Consultant (Owner)Commented:
Is the Wi-Fi router for sure on your office network?  Did someone plug the Ethernet cable into the WAN port of the Wi-Fi router?  The Ethernet cable should go to a LAN port on the wireless router and DHCP on the wireless router should be turned OFF.

Check the above as the remaining part of the setup seems OK.

Check the SBS 2011 firewall that it is not blocking access.
Rais KevalSearch Engine Evaluation analysts Commented:
Ok so the first thing to do ideally would be to disconnect all wifi routers and do a hard reset on the network if that doesn't work refer it to your network provider technication
SteveWright01Author Commented:
Hi John
Thanks for your reply and i have already checked that. DHCP is definitely off on the router as well.
I have also flushed DNS,  reset winsock on one of the clients that wont connect to the internet. I did think as i was driving back from the office that if i disconnect the LAN cable into the server, then enable DHCP within the router and see if the problematic WiFi clients get internet that way it rules out the router and then points to a server / firewall issue. Cant think of what else to try.
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JohnBusiness Consultant (Owner)Commented:
Try that to see. That may put the wireless router on a different subnet
David Johnson, CD, MVPOwnerCommented:
Are you using WPA2-Personal w/shared key or WPA2-Enterprise?
If using WPA2 Personal then the server has nothing to do with the network connection the problem exists in your router/cable modem.
It could be a DNS issue from the server from a workstation connected via WIFI do an ipconfig /all and check that the ONLY DNS entry is your servers DNS ip address.
from a command prompt do a NSLOOKUP google.com or other internet address and see if you get dns resolution?
On your DNS server have you setup forwarders or are you simply using root hints? suggest forwarders and
SteveWright01Author Commented:
Thanks for your replies guys, issue now appears to be resolved with the exception of one device.

After isolating the server and activating DHCP within the router I could get WiFi connectivity. Dropped the server back in and scoured the event logs looking at DNS and DHCP issues but couldn’t really spot anything. Reset Winsock and also did netsh int ip reset c:\resetlog.txt. Plus a server reboot and things have started working again. So it’ll be a case of keeping an eye on things for the next week or so to see if it has been totally resolved.

Again thanks for your responses.

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SteveWright01Author Commented:
Issue resolved by myself
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