Ah, the AD auth spiral of doom. Very puzzling that one. Never really got to the bottom of what exactly the cause was
Have you looked at setting Windows registry entry MaxConcurrentApi (see https://support.microsoft.com/kb/975363?wa=wsignin1.0)? ============================================================== Please consider the environment before printing this email. If you have received this message in error, please notify the sender and immediately delete this message and any attachment hereto and/or copy hereof, as such message contains confidential information intended solely for the individual or entity to whom it is addressed. The use or disclosure of such information to third parties is prohibited by law and may give rise to civil or criminal liability. The views presented in this message are solely those of the author(s) and do not necessarily represent the opinion of Iberdrola USA Networks, Inc. or any company of its group. Neither Iberdrola USA Networks, Inc. nor any company of its group guarantees the integrity, security or proper receipt of this message. Likewise, neither Iberdrola USA Networks, Inc. nor any company of its group accepts any liability whatsoever for any possible damages arising from, or in connection with, data interception, software viruses or manipulation by third parties. ==============================================================