Marketo Instance Access Issue

Hi Vinay,

Yes I have been experiencing this issue since Sunday night. This is one of the worst issues I've ever faced but I'm glad to know its not just me, as this could be part of a broader problem. 

I've been in contact with Support since yesterday and tried many diagnostic steps. So far the only thing that has helped is going to an entirely new network and connecting there. Oddly enough, I went to my local library yesterday to try this and it worked but then I got the issue again on that network, which locked me out again with the same loading error.

What I noticed that seemed to trigger the error both times was Marketo crashing and prompting a refresh while I was working in the email editor. Upon inspecting the load error page I see this issue being thrown on the console. After reading up on CORS it seems that Marketo is failing to attach the required preflight-request in the header.

All of that being said I am still waiting to find a solution from Support. As we speak I am at a family member's house where I can access on their network since my home and local library are now "blocked".

Hi @vinay_kumar, please check if you connected with any VPN.

I was facing the same issue with VPN but after disconnecting VPN, everything works fine.

Has support come to a resolution for you? Im currently going through this same problem with no solution except tethering to my phone's network. If that gets blocked Im out of luck. The only thing I've seen changed as of yesterday, when this stated happening to me, was seeing this when trying to login to Marketo