WSKeys expire after 3 months without use, and are automatically deleted after 12 months without use. This can mean the Offline Client is unable to synchronize transactions if it hasn't been used for awhile.
To avoid this, we recommend the following preventative maintenance:
If your WSKey has expired, please visit How can I renew my WSKeys or contact OCLC Support with the WSKey number to get it renewed.
Please visit Offline Client for more information. If you need to locate your library's WSKey's please visit How do I find my WSKey?