Unknown error -999 and VPP errors

I am using Server 4.1.5 and last week my vpp quit syncing. In the devicemgrd.log file I see the below error message. I also see VPP sync's starting and then error 9603 errors. Is anyone else having this problem?

https://mdmenrollment.apple.com/account

TYPE | DATA

————————+—————————————————————————————————————————————————————————————————— ——————————————————

REQUEST

HEADERS | ———————————————————————————+————————————————————————————————————— ——————————————————

| Content-Type : application/json;charset=UTF8

| User-Agent : ProfileManager-devicemgrd/886.209.(nu ll) (14F27 x86_64)

| X-ADM-Auth-Session : <********>

| X-Server-Protocol-Version : 1

| ———————————————————————————+————————————————————————————————————— ——————————————————

————————+—————————————————————————————————————————————————————————————————— ——————————————————

RESPONSE

STATUS | 401

BODY | Unauthorized

————————+—————————————————————————————————————————————————————————————————— ——————————————————

————————+—————————————————————————————————————————————————————————————————— ——————————————————

ERROR

MESSAGE | Unknown error -999

1:: [280] [2016/03/15 13:46:30.490] No more Device Enrollment Program devices a vailable

0:: [280] [2016/03/15 13:46:30.524] INCREMENTAL sync of Device Enrollment Progr