sql 2005 local database lost without ethernet

I'm running rms 1.3 with sql 2005. If my router reboots or if I unplug my ethernet cable I get kicked out of POS or Manager and receive a database connection lost error message. I can understand this on a remote machine but why on a local database machine. I wouldn't think the local database would need an ethernet connection...i'm assuming I have something wrong in SQL...is there an sql 2005 database implementation guide for rms 1.3...the version I have only covers msde 2000...any help would be appreciated