WCF REST Service not working with log4net -

i've written wcf rest service uses log4net.

my problem cannot rest service , logging service work simultaneously.

example:

public string test() {      //log.debug("test called.");      return "xyz"; }

calling method browser @ localhost:49721/myservice/test gives me result: xyz

if uncomment logging row there correct output logfile.

2014-12-16 10:44:56,463 [25] debug myservice - test called.

however, don't receive result rest service, when calling method browser. (using chrome developer tools can see see status "pending".)

any suggestions?

edit 1:

this how initiate logger:

private static readonly ilogger log = logmanager.getlogger(typeof(myservice));

Deter