Network Issue Internet Slow

past two weeks, users have complained of slow internet connection. Nothing was changed or added to network. I've checked the ISP service by using laptop directly to fiber/ethernet port and no issues. we get the error for all websites as attached. But if users wait at-least a minute, the site will load. switches have spanning tree enabled and have not found any loops. any suggestions? I've installed Wireshark and notice quite a bit of broadcast, but from what I've read from google, sounds like broadcasts are normal. any suggestions would be greatly appreciated.
GrizNation23IT DirectorAsked:
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Mitul PrajapatiIT SupervisorCommented:
Steps may help you.

(1) check in to your firewall, it is taking too long to process the request.

(2) Take the laptop in which you are facing a slower internet connection issue. Directly plugged it to the main connection as you have done for your laptop. If it is working fine, then it could be a virus issue.

(3) It could be one of the network switch or switch port is malfunctioning may cause this issue.
Martin MillerCTOCommented:
A couple suggestions:

* Try this website,, and test your connection when it's good and when it's slow. Make note of the results, and there will be variations on tests.
* open a command prompt and use ping command to a couple sites and not the ping time
   e.g.   ping         ping anotherwebsite, etc...
* open a command prompt and use trace route command. Read up on what trace route does.
  e.g   traceroute      or in Windows Command Prompt tracert
Regarding broadcast, not all amount of broadcast can be considered normal. Broadcast storm can be cause by constant network reconvergence. STP reconvergence can take 30-50 seconds so it could match to 1 minute waiting for service to be available again, but it could be totally unrelated. Broadcast storms can also be caused by faulty NIC.
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GrizNation23IT DirectorAuthor Commented:
Thank you all for suggestions, I will be checking these today and update asap...
GrizNation23IT DirectorAuthor Commented:
Martin I did a ping to Google as soon as internwt slowed and got a 100% loss, but as soon as I was getting to tracert it pinged successfully and page loaded on browser. And my isp speed test was 630 mb up and 628 mb down...
Martin MillerCTOCommented:
You are on the right track to understanding the slow network... now we need to dig into this.

Packet loss is happening, but, where ?

Eliminate your computer, cables, etc...
Validate you NIC, network cables, connections, etc..

Eliminate your infrastructure:
Can you confirm your network versus external network?  e.g network devices: switches, router, firewall

Eliminate your DNS
Here is a worthy link for validation of DNS:

Eliminate your network provider
Call them, look for their status page, look for their twitter feed on network issues.

Eliminate internet "storms"
Please do a search with your provider name included
GrizNation23IT DirectorAuthor Commented:
I just noticed my hp trunk is down back to one of my remote switches. hmmm

got a traceroute successfully:

1st try:
3 ms    <1 ms     1 ms  10.*.*.* (internal LAN)
  2     *     1483 ms    13 ms  *.*.*.* (ISP Internet Port)
  3    17 ms    17 ms    17 ms  *.*.*.* (External)

2nd try:
<1 ms    <1 ms    <1 ms  10.*.*.* (internal LAN)
  2     *        *      986 ms  *.*.*.* (ISP Internet Port)
  3    17 ms    17 ms    17 ms  *.*.*.* (External)

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Martin MillerCTOCommented:
Looks like the trunk down is root cause, let's close this.
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