Honestly my job used to have this error alot. Sometimes it would mean that the account was locked or the time deviated at some point and the server locked you out. When I crossed into the Mountain Time Zone from the Eastern one, I got this error a lot. I had to turn off automatic time zone set to get it to stop. I think changing the clock will often lock out your account.
With my job, they couldn't figure it out so they unlocked it and gave me a new token which they synced up and I was fine after that.
The other option is to try Shrewsoft VPN which will let you load in those Cisco VPN pcf files. It really works pretty well for the price ($10). I used it in Win10 for a while until my job upgraded to AnyConnect which is far less problematic.