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Cisco RV215W VPN communication problems


I am using Cisco RV215W VPN Router with the latest Firmware ( The router functions are OK, even the inbound PPTP client connection is quick. However, the problem comes up after the VPN connection is made and http console access to the networked NAS: the communication becomes very slow and even the VPN connection fails! The RV215W log shows the following:


30    2015/12/25 4:10:02 PM    warning    pppd[2509]: Warning - secret file /tmp/ppp/pap-secrets has world and/or group access    
31    2015/12/25 4:08:58 PM    err    pptpd[2435]: CTRL: PTY read or GRE write failed (pty,gre)=(15,16)    
32    2015/12/25 4:08:58 PM    err    pptpd[2435]: GRE: read(fd=15,buffer=451c4c,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs    
33    2015/12/25 4:08:55 PM    err    pppd[2436]: MPPE disabled    
34    2015/12/25 4:04:55 PM    warning    pppd[2436]: Warning - secret file /tmp/ppp/chap-secrets has world and/or group access    
35    2015/12/25 4:04:55 PM    err    pptpd[2435]: GRE: Bad checksum from pppd.


(There are no communication issues when connecting to NAS http console on LAN.)

Any ideas what's wrong with VPN (connection)???