THREE DAYS of debugging, reading all the logs I could find, creating tens of new logs in our appliaction, and SUDDENLY an email from your IT admin:

"Hey your CURL requests are being rejected by my !oh so secure! firewall rule".

Not that I haven't said at the beggining, that THIS IS YOUR F...G NETWORK PROBLEM because we get "connection reset by peer" errors, and you ASSURED that everything is CHECKED and OK!

Always double check the code you're sending to the teacher after finishing a school project.

I once sent them an old version of the code that had useless comments and debug messages everywhere. Some of them "politely" pointed out the fact that I really hated the subject, that it was pointless and that the assignment was way overcomplicated for first year students.