pptpd[7282]: GRE: read(fd=7,buffer=80567c0,len=8260) from network failed: status = -1 error = Protocol not available
pptpd[7293]: GRE: read(fd=7,buffer=80567c0,len=8260) from network failed: status = -1 error = Protocol not available
pptpd[7510]: GRE: read(fd=7,buffer=80567c0,len=8260) from network failed: status = -1 error = Protocol not available
pptpd[8916]: GRE: read(fd=7,buffer=80567c0,len=8260) from network failed: status = -1 error = Protocol not available