I figured I would chime in with a few additional things on this one:
- Agreed about what John mentioned above (that these specific errors usually involve the file location and permissions), and there is an article about this as well: http://www.symantec.com/docs/TECH122776
Although that doc was written for 12.1 RU5, the same scenario could apply with any build.
- Assuming you are using Autoupgrade (i.e. assigning packages to client groups per: http://www.symantec.com/docs/HOWTO80780), are you hosting the file on a URL somewhere other than the SEPM (as mentioned in TECH122776 above)? If so, would it be possible to try instead letting the clients receive the package directly from the SEPM?
- If you're using remote push (CDW - per this doc: http://www.symantec.com/docs/TECH164327), then please also ensure your clients are prepped in advance per this document: http://www.symantec.com/docs/HOWTO80805
I don't think sylink log alone would be enough to troubleshoot this. The scm-server logs (and potentially even a Procmon from a client) would help. Please let us know any further info. This may also be a good situation to open a case with Support for. Thank you.