This problem may due to bug 122794 - Restart in SGOS 188.8.131.52.37535 HWE 0x0 SWE 0xFFFF0001
If bug 122794 occurs, ICAP health-state reported as 'unknown'
Bug 122794 has been fixed in SGOS 184.108.40.206. Blue Coat recommends updating to SGOS 220.127.116.11. You can download SGOS 18.104.22.168 from https://bto.bluecoat.com/download/product/13 (BTO login credentials are necessary). If the issue persists, please contact Bluecoat Technical Support.