SMC 7008ABRv2 and 7004VBRv1 updated firmware corrects port 1900 issue.
SMC has released updated firmware for their 7008ABRv2 (part number: 750.9814)
and 7004VBRv1 routers that permanently fixes the port 1900 issue, making port
1900 no longer be WAN (internet) accessible.
The firmware update for the 7008ABRv2 (version 1.035) is available from:
http://www.smc.com/index.cfm?sec=Support&pg=Download-Details&prod=243&site=c
The firmware update for the 7004VBRv1 (version 1.232) is available from:
http://www.smc.com/index.cfm?sec=Support&pg=Download-Details&prod=257&site=c