When I try to open an ACSM file in Adobe Digital Editions, I get the following message:
Unable to Download
Error getting License. License Server Communication Problem: E_ADEPT_REQUEST_EXPIRED
Adobe's troubleshooting page says this is caused by two issues: either incorrect time/date/timezone settings, or trying to open a loaned book after its deadline has expired. However, neither of those are the case: my time and timezone settings are accurate (also, before today I had no problem opening ACSM files, and I have made no changes to my time and date settings since), and the expiry period is 180 days and I'm opening it literally right after it downloads.