PPTP Tunnle出现中断情况,有朋友知道如何解决吗?

通过两台UBNT ER-X进行PPTP VPN的搭建,但是出现了PPTP tunnel中断无法建立的情况,以下是log的一部分代码,有朋友知道如何解决吗?

Mar 21 14:37:44 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:414]: buffering packet 707 (expecting 642, lost or reordered)
Mar 21 14:37:44 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:414]: buffering packet 708 (expecting 642, lost or reordered)
Mar 21 14:37:44 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:414]: buffering packet 709 (expecting 642, lost or reordered)
Mar 21 14:37:44 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:414]: buffering packet 710 (expecting 642, lost or reordered)
Mar 21 14:37:46 ubnt ntpd_intres[2454]: host name not found: 2.ubnt.pool.ntp.org
Mar 21 14:37:46 ubnt ntpd_intres[2454]: host name not found: 3.ubnt.pool.ntp.org
Mar 21 14:37:47 ubnt ntpd[2288]: ntpd exiting on signal 15
Mar 21 14:37:47 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:405]: discarding duplicate or old packet 514 (expecting 842)
Mar 21 14:37:49 ubnt ntpd[2896]: ntpd 4.2.6p2@1.2194-o Thu Jan 25 08:56:28 UTC 2018 (1)
Mar 21 14:37:49 ubnt ntpd[2897]: proto: precision = 42.948 usec
Mar 21 14:37:51 ubnt pptp[2099]: anon log[decaps_gre:pptp_gre.c:405]: discarding duplicate or old packet 515 (expecting 842)
Mar 21 14:37:51 ubnt ntpd_intres[2903]: host name not found: 0.ubnt.pool.ntp.org
Mar 21 14:37:51 ubnt ntpd_intres[2903]: host name not found: 1.ubnt.pool.ntp.org
Mar 21 14:37:51 ubnt ntpd_intres[2903]: host name not found: 2.ubnt.pool.ntp.org
Mar 21 14:37:51 ubnt ntpd_intres[2903]: host name not found: 3.ubnt.pool.ntp.org
Mar 21 14:37:52 ubnt pptp[2107]: anon log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
Mar 21 14:37:52 ubnt pptp[2107]: anon log[callmgr_main:pptp_callmgr.c:258]: Closing connection (shutdown)
Mar 21 14:37:52 ubnt pptp[2107]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 ‘Call-Clear-Request’
Mar 21 14:37:52 ubnt pptp[2107]: anon log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
Mar 21 14:37:52 ubnt pptp[2107]: anon log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Mar 21 14:37:52 ubnt pppd[2164]: Modem hangup
Mar 21 14:37:52 ubnt pppd[2164]: Connection terminated: no multilink

楼主,问题解决了吗?