Urgent Assistance Required: Some Site not reachable

[sc0ttjm]

We're suddenly getting error messages on multiple sites like this:

Access Denied
You don't have permission to access "http://[website]" on this server.
Reference #18.95fc645f.1625146667.36443df4

I did some googling and found it could be an Akamai blocking list, but the lookup tool will not work on my server:

https://www.akamai.com/us/en/clientrep-lookup/

If we have been blocked by them, their website says they cannot unblock us it is down to the sites using their list to ask them to unblock our address.

We are not aware of doing anything wrong but cannot access multiple site form our RDP servers now as a result.
If we are being blocked, we need to be able to use an external proxy or something so we can still access these sites.  Is this possible and if so how and who would you recommend?

We're desperate here as we can't access sites used for everyday business.

Any help greatly appreciated.
Thanks!