Flickr, WordPress and wrong user name and password xmlrpc.php error

Looking at the logs, there are various explanations for this issue. My was a little more stranger than usual: Flickr would say failed, while WordPress would correctly show the test post.

I found my solution looking at the logs.

[client xxxxxxxx] PHP Fatal error: Allowed memory size of ********* bytes exhausted (tried to allocate ***** bytes) in ****************/wp-includes/cache.php on line **

See also:

The solution was simple; just add this line to your .htaccess file (assuming your can access it)

php_value memory_limit XX000000

where XX you can put your reasonable amount of memory (those are bytes).
Maybe you can tweak it raising it step by step. Simply writing down a large amount is not very healthy.
Anyway, 99% it’s your side fault, not Flickr fault.