Firebirdserver 2.5: inet_error: 113

$ less /var/log/firebird2.5.log  
c2012   Thu May 10 10:12:38 2012  
        INET/inet_error: read errno = 113  

c2012   Thu May 10 11:21:02 2012  
        INET/inet_error: read errno = 104  

http://www.firebirdfaq.org/faq120/

What are those error codes I see in firebird.log on Linux?
Errors like 'INET/inet_error: read errno = ' are networking errors.
113 /* No route to host /
104 /
Connection reset by peer */