A few things…..
First, the HTTP error 502 is an intermittent issue that has been known to happen from time to time. Rest assured that the problem does resolve itself in time.
Second, I had to reset your passkey in order to maintain your account security. See, in the screenshot that you attached to your post, you included your announce URL, which includes your passkey. This passkey is yours and yours alone, and is used to identify your user account to the tracker. Since there is no way for me to remove the image you posted, I had no other option but to reset your passkey so that it is not posted in public. 
This will mean that for all torrents that you are downloading or have downloaded, the .torrent files will no longer work and will need to be redownloaded in order to continue to seed and download content.