We have a problem with our application that seems to occur only from certain IP addresses. If we make any authenticated API call from our offices we receive a HTTP 500 error with code 131 in the reply. If we then try from a different IP address, via a VPN for example, the call successfully completes.
I had thought our IP address may have been blacklisted but according to the documentation we should receive no reply at all from the calls. Similarly, if our application had been blacklisted then the calls from different IP addresses would also fail.
I’m at a loss to what the problem could be so any help would be appreciated!