no access to dashboards for my sites

for about three days now that I know of there has been no access to our dashboards or any admin controls for our wordpress sites. Sites are hosted by 1and1 and seem to be working fine, jsut the WP-Admin that gives up the message “Service Temporarily Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.” for any of our three WP sites when we try to access the dashboards.
Anyone else seeing this problem?? WHere to go for solutions?
Thx