How to increase logging for debugging of LDAP authentication setup?

[Fright]

I consider this "solved" for me, though I am willing to help test things if you want

thanks for sharing the results.
if the main problem is solved, then I suggest stopping at this. further research would be more convenient to carry out with access to the ldap server  ;)
all the diagnostic additions mentioned in the topic except the last one have already been merged by @AdSchellevis. I will try to make a request to add the latter (with a timelimit diagnostic message).
Thanks again, imho the result is quite good additions to the tester page

[gromit]

Thank you for all your help, and I agree that more information in the "Tester" page is a welcome addition.