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I'm not a network engineer, but we are having a major issue at work. We are unable to access sendgrid.com through our office network, but we can access all the website we need to access.

I did a tracert and got the following result.

enter image description here

The first ip is our in house server and the next two IPs seems to be from our ISP, but I have no idea what the next ip address is. Does this looks like it's a problem outside of our office network or could it still be a problem internal to our network?

Is there any other way to debug this?

Any help much appreciated.

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    Please don't ever post text as screenshot but copy and paste text as text, and format using the { } function. – Zac67 Sep 11 at 18:17
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I have no idea what the next ip address is

81.25.207.21 belongs to Verio UK - likely some router on the way.

Does this looks like it's a problem outside of our office network or could it still be a problem internal to our network?

When you can't connect it's either an upstream firewall (=your own) filtering the request or there's a network problem with the ISP or one of its peers on the path.

You should verify that's it not your own firewall and then open a support case with your ISP.

tracert may not show the same behavior as an HTTP request, depending on your firewall. Check its config and its logs to make sure.

  • Thanks for your input @Zac67, we switched off the firewall and tried to access sendgrid, but got the same problem. Contacted ISP and still waiting for a response. – Amila Sep 15 at 19:35
  • "switched off the firewall" - I was refering to the network firewall, not the host one. – Zac67 Sep 15 at 20:10

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