strange! all extensions can't register with server after reboot. also "service fail2ban stop", but nothing happened.
Log as below:
FreeSWITCH Started
Max Sessions [1000]
Session Rate [30]
SQL [Enabled]
2017-10-20 23:48:20.490553 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:48:20.490553 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #2
2017-10-20 23:48:21.490560 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:48:52.610544 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:48:52.630540 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #3
2017-10-20 23:48:53.610547 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:49:24.750558 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:49:24.750558 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #4
2017-10-20 23:49:25.750540 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:49:56.850536 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:49:56.850536 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #5
2017-10-20 23:49:57.850526 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:50:28.910541 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:50:28.990523 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #6
2017-10-20 23:50:29.910536 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:51:00.970532 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102
2017-10-20 23:51:00.990555 [ERR] sofia_reg.c:2447 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration with status Service Unavailable [503]. failure #7
2017-10-20 23:51:01.990531 [WARNING] sofia_reg.c:505 1fad83f7-e77b-44c8-8ae1-606c488a2102 Failed Registration [503], setting retry to 30 seconds.
2017-10-20 23:51:32.050524 [NOTICE] sofia_reg.c:448 Registering 1fad83f7-e77b-44c8-8ae1-606c488a2102