I use Pocket as a personal bookmarking service. Using IFTTT.com I can use a recipe that monitors my Pocket feed and then sends new posts to my WordPress blog.
Recently though, this stopped working. The WordPress channel needed reconnecting, and the error I received every time I tried to connect was:
Unable to verify WordPress credentials. Please try again.
Thinking it was one of the security plugins I had used in WordPress, I switched them all off. The error remained. I had been doing some HTTPS redirection to make sure my site in always in HTTPS, so I switched that off too. Still no joy.
Finally I remembered that my site is protected by Cloudflare. When I ‘paused’ Cloudflare, the recipe worked.
My assumption was that Cloudflare was blocking IFTTT requests, assuming that they were attacks on my WordPress installation, but I couldn’t see any logs in the firewall logs in my Cloudflare account.
After wondering around in the Cloudflare settings, I turned items on and off to see if they would make a difference.
It turns out that there is one setting that can cause and therefore fix this problem!
I had a ‘Page Rule’ to force HTTPS always. IFTTT appears to assume HTTP and doesn’t support HTTPS! Bad IFTTT sending my blog logins over HTTP.