DevCentral access using Chrome - The requested URL was rejected. Please consult with your administrator.

*Answers own question after spending some more time looking into it :) *

I discovered that I could actually access Devcentral from Chrome within a VM - so sounded like it was something to do with this particular Chrome rather than all Chrome browsers. I'd already looked at that and cleared my cache, and disabled all my Chrome extensions (as I'd had problems with some of those intercepting websites and breaking things - eg. ones which provide IP and domain information on the web-site) - which made me think that it wasn't anything to do my with Chrome - hence the question on here.

But then I thought of cookies - which I hadn't cleared. Rather than clear all my cookies - I used the "EditThisCookie" Chrome extension - which lets you see just the cookies for the page you're on. I deleted all the ones with 'Devcentral' or 'F5' - and now I can access DevCentral again.

So sounds like F5's ASM was objecting to something in my cookies...which presumably that same F5 ASM had set for my browser anyway...

So I'm happy now! Just out of curiosity though - anyone with ASM experience have any ideas why ASM would be doing that?