By April 18, 2017, Symantec will decommission the “Legacy” timestamping service.
(Legacy) RFC 3161 SHA128 Timestamp Service:
To support business continuity for our customers, we have provided the following replacement services.
(New) RFC 3161 Service SHA256:
Important: Customers must leverage SHA256 Timestamping service going forward, and should not use a SHA1 service unless there is a legacy platform constraint which doesn’t allow use of SHA2 service (in this case you can use this new URL: RFC 3161 Service SHA128: http://sha1timestamp.ws.symantec.com/sha1/timestamp).