IP blocked - what to do in this case?

hekur · 2022-03-11T11:37:00+00:00

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Hello, yesterday I noticed that my TeamViewer could not connect to the server. So I started turning off antivirus, firewall, etc and finally when was trying to open https://www.teamviewer.com in the browser I got this:

Seems like my ISP's IP was blocked by firewall, and it was the root cause why my TeamViewer could not connect to the server. Could someone please help with removing it from the black list?

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hekur

@mekong , great news. And I can confirm that it works for me too. Thanks.

JoshP

Hello @mekong & @hekur

I am glad to hear that it is working again!

Should the issue re-appear, please let us know - it sounds like some kind of interrupption between our servers and your ISPs may have been the issue.

I can confirm however that we had no such blocks on our side in place, nor server issues.

Take care and stay safe!

JoshP

Hello @hekur & @c3pio

Thank you for your posts, and welcome to the TeamViewer community!

Could you please try on another network, or by using cellular service?

I ask this because some ISPs actually block access to services like TeamViewer. Here is one example:

https://community.teamviewer.com/English/discussion/4577/talktalk-imposes-extensive-traffic-filter-in-the-uk

Should the issue persist, any other information you can provide us will help us better understand the issue.

Thanks in advance for any more information!

mekong

Now everything is working

c3pio

Same problem, remove the block of ip addresses from the black list!

hekur

Hey @JoshP , so I checked through 5G, VPN, proxy, other IP form the same ISP:

5G, VPN, proxy - it works

other IP - same issue

Also, checked headers, there is one of interest: server: cloudflare

Could it be that CloudFlare blocks IPs? Or you sure that's on ISP side?

hekur

@JoshP , just did a test with ISP - they switched me to another, dynamic IP and TeamViewer started working. When they switched me back to my static IP - it stopped working again. And they insist that they do not block anything.

So, seems like issue theoretically can be that WAF or some other kind of firewall or part of infrastructure started blocking IPs on your side. As I already said, I spotted mentioning of CloudFlare in webbrowser header, could it be that some rules in CloudFlare WAF on your side blocked range of IPs of this ISP?

Here is a range and related AS info:

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mekong

Hi @hekur ! I hame the same problem ... yours ISP is X-City , my Datagroup in Khelnitskiy .

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