I recently upgraded my server to CouchDB 1.5 and I'm continually seeing this error message in the logs. CouchDB appears to be behaving properly accept for this error.
Fri, 14 Feb 2014 19:07:35 GMT] [error] [<0.105.0>] {error_report,<0.31.0>,
{<0.105.0>,crash_report,
[[{initial_call,
{mochiweb_socket_server,init,['Argument__1']}},
{pid,<0.105.0>},
{registered_name,[]},
{error_info,
{exit,eaddrinuse,
[{gen_server,init_it,6,
[{file,"gen_server.erl"},{line,320}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,239}]}]}},
{ancestors,
[couch_secondary_services,couch_server_sup,<0.32.0>]},
{messages,[]},
{links,[<0.94.0>]},
{dictionary,[]},
{trap_exit,true},
{status,running},
{heap_size,1598},
{stack_size,27},
{reductions,593}],
[]]}}