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  1. #1

    Problem PPTP Vpn with TL-R600VPN

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    Hello to all
    I have a router TL-R600VPN v2, firmware versione 1.2.3 Build 140801 Rel.49374n

    I have a problem with vpn pptp,
    sometimes it blocks me and does not access vpn. From none of the users created.
    Everything else works, only vpn does not go.

    To reset it I must always reboot the router.

    Any idea?

    Thank's

    Alessio

  2. #2
    Members Panda is on a distinguished road
    Join Date
    Aug 2016
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    105
    Hey dude, you mean your PPTP VPN server will stop working sometimes? Have you ever try to reopen the function again. Turn off the PPTP server and turn it on again.
    What's more, you can try to test if the port 1723 is opened when the issue happen.

  3. #3
    Hi,
    yes the PPTP VPN server stop many time. Every time i need to reboot the tplink.
    The port is always regular opened

  4. #4
    Members Panda is on a distinguished road
    Join Date
    Aug 2016
    Posts
    105
    If the port 1723 closed sometimes, maybe there is something in your network attack to make the router close it. So it stop working.
    I am not sure what it is. Maybe you can find some in the log?

  5. #5
    This is the logs when there is the problem

    ################################################## ##################
    # TL-R600VPN System Log
    # Time = 2017-09-20 20:00:22 1323995s
    # H-Ver = R600VPN v2 00000000 : S-Ver = 1.2.3 Build 140801 Rel.49374n # L = 192.168.10.200 : M = 255.255.255.0 # W1 = STATIC IP : W = 192.168.1.254 : M = 255.255.255.0 : G = 192.168.1.1 ################################################## ##################

    Sep 15 19:09:57 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 dns3=0.0.0.0]
    Sep 15 19:09:57 PPP INFO sent [IPCP Nak addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 15 19:09:57 PPP INFO rcvd [IPCP Req addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 15 19:09:57 PPP INFO sent [IPCP Ack addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 15 19:27:30 PPP INFO rcvd [LCP TermReq]
    Sep 15 19:27:30 PPP ERROR LCP down
    Sep 15 19:27:30 PPP WARNING LCP down
    Sep 15 19:27:30 PPP INFO sent [LCP TermAck]
    Sep 15 19:27:30 PPP ERROR User request
    Sep 15 19:27:33 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection finished
    Sep 15 19:27:33 VPN INFO PPTPS CTRL: Client pppd TERM sending
    Sep 15 19:27:33 VPN INFO PPTPS CTRL: Client pppd finish wait
    Sep 15 20:00:22 OTHER INFO Mail successfully.
    Sep 15 20:11:50 VPN INFO PPTPS CTRL: Client 59.111.30.195 control connection started
    Sep 15 20:11:50 VPN ERROR PPTPS CTRL: EOF or bad error reading ctrl packet length.
    Sep 15 20:11:50 VPN ERROR PPTPS CTRL: couldn't read packet header (exit)
    Sep 15 20:11:50 VPN ERROR PPTPS CTRL: CTRL read failed
    Sep 15 20:11:50 VPN INFO PPTPS CTRL: Client 59.111.30.195 control connection finished
    Sep 15 23:12:15 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 15 23:12:16 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 15 23:12:16 VPN WARNING PPTPS MGR: initial packet length 18245 outside (0 - 220)
    Sep 16 20:00:22 OTHER INFO Mail successfully.
    Sep 16 22:07:48 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 16 23:12:21 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 16 23:12:21 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 16 23:12:22 VPN WARNING PPTPS MGR: initial packet length 18245 outside (0 - 220)
    Sep 17 17:46:56 VPN INFO PPTPS CTRL: Client 139.162.102.46 control connection started
    Sep 17 17:46:57 VPN ERROR PPTPS CTRL: EOF or bad error reading ctrl packet length.
    Sep 17 17:46:57 VPN ERROR PPTPS CTRL: couldn't read packet header (exit)
    Sep 17 17:46:57 VPN ERROR PPTPS CTRL: CTRL read failed
    Sep 17 17:46:57 VPN INFO PPTPS CTRL: Client 139.162.102.46 control connection finished
    Sep 17 20:00:22 OTHER INFO Mail successfully.
    Sep 17 23:12:11 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 17 23:12:11 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 17 23:12:12 VPN WARNING PPTPS MGR: initial packet length 18245 outside (0 - 220)
    Sep 18 10:01:15 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection started
    Sep 18 10:01:15 VPN INFO PPTPS CTRL: Starting call (launching pppd, opening GRE)
    Sep 18 10:01:15 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0xc026cb5f pcomp accomp]
    Sep 18 10:01:15 PPP INFO rcvd [LCP Req mru=1400 magic=0x31a04ca5 pcomp accomp callback=CBCP]
    Sep 18 10:01:15 PPP INFO sent [LCP Rej callback=CBCP]
    Sep 18 10:01:15 PPP INFO rcvd [LCP Req mru=1400 magic=0x31a04ca5 pcomp accomp]
    Sep 18 10:01:15 PPP INFO sent [LCP Ack mru=1400 magic=0x31a04ca5 pcomp accomp]
    Sep 18 10:01:18 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0xc026cb5f pcomp accomp]
    Sep 18 10:01:18 PPP INFO rcvd [LCP code=0xc]
    Sep 18 10:01:18 PPP INFO sent [LCP CodeRej]
    Sep 18 10:01:18 PPP INFO rcvd [LCP code=0xc]
    Sep 18 10:01:18 PPP INFO sent [LCP CodeRej]
    Sep 18 10:01:21 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0xc026cb5f pcomp accomp]
    Sep 18 10:01:21 PPP INFO rcvd [LCP Req mru=1400 magic=0x31a04ca5 pcomp accomp]
    Sep 18 10:01:21 PPP INFO sent [LCP Ack mru=1400 magic=0x31a04ca5 pcomp accomp]
    Sep 18 10:01:21 PPP INFO rcvd [LCP Ack asyncmap=0x0 auth=chap-MS-v2 magic=0xc026cb5f pcomp accomp]
    Sep 18 10:01:21 PPP INFO sent [CHAP Challenge (c0676084aa64cf98813dd1b984de89cb), name = "pptpd"]
    Sep 18 10:01:21 PPP INFO rcvd [CHAP Response (9c6851ab3ce57f9e45ab914be2e4ee7500000000000000000 bb5db588e6e20df2d67f39af2639d6259b644a3b250aa7800) , name = "cassiopea"]
    Sep 18 10:01:21 PPP INFO sent [CHAP Success "S=763590C98B85F5100A52B47A0479D9201976B40A M=Access granted"]
    Sep 18 10:01:21 PPP INFO sent [CCP ConfReq mppe +H -M +S -L -D -C]
    Sep 18 10:01:21 PPP INFO rcvd [CCP ConfReq mppe +H -M -S -L -D -C]
    Sep 18 10:01:21 PPP INFO sent [CCP ConfNak mppe +H -M +S -L -D -C]
    Sep 18 10:01:21 PPP INFO rcvd [CCP ConfAck mppe +H -M +S -L -D -C]
    Sep 18 10:01:21 PPP INFO rcvd [CCP ConfReq mppe +H -M +S -L -D -C]
    Sep 18 10:01:21 PPP INFO sent [CCP ConfAck mppe +H -M +S -L -D -C]
    Sep 18 10:01:21 PPP INFO sent [IPCP Req addr=192.168.10.200]
    Sep 18 10:01:21 PPP INFO rcvd [IPCP Ack addr=192.168.10.200]
    Sep 18 10:01:23 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 ms-wins=0.0.0.0 dns3=0.0.0.0 ms-wins=0.0.0.0]
    Sep 18 10:01:23 PPP INFO sent [IPCP Rej ms-wins=0.0.0.0 ms-wins=0.0.0.0]
    Sep 18 10:01:23 PPP INFO rcvd [proto=0x8057] 01 0b 00 0e 01 0a 5c 50 f7 46 c4 f0 42 98
    Sep 18 10:01:23 PPP INFO sent [LCP ProtRej]
    Sep 18 10:01:23 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 dns3=0.0.0.0]
    Sep 18 10:01:23 PPP INFO sent [IPCP Nak addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 10:01:23 PPP INFO rcvd [IPCP Req addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 10:01:23 PPP INFO sent [IPCP Ack addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 14:08:30 VPN INFO PPTPS CTRL: Client 139.162.102.46 control connection started
    Sep 18 14:08:31 VPN ERROR PPTPS CTRL: EOF or bad error reading ctrl packet length.
    Sep 18 14:08:31 VPN ERROR PPTPS CTRL: couldn't read packet header (exit)
    Sep 18 14:08:31 VPN ERROR PPTPS CTRL: CTRL read failed
    Sep 18 14:08:31 VPN INFO PPTPS CTRL: Client 139.162.102.46 control connection finished
    Sep 18 19:11:16 VPN WARNING PPTPS MGR: initial packet length 5635 outside (0 - 220)
    Sep 18 19:11:19 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 18 19:11:20 VPN INFO PPTPS CTRL: Client 164.52.7.134 control connection started
    Sep 18 19:11:20 VPN ERROR PPTPS CTRL: EOF or bad error reading ctrl packet length.
    Sep 18 19:11:20 VPN ERROR PPTPS CTRL: couldn't read packet header (exit)
    Sep 18 19:11:20 VPN ERROR PPTPS CTRL: CTRL read failed
    Sep 18 19:11:20 VPN INFO PPTPS CTRL: Client 164.52.7.134 control connection finished
    Sep 18 19:18:28 PPP INFO rcvd [LCP TermReq]
    Sep 18 19:18:28 PPP ERROR LCP down
    Sep 18 19:18:28 PPP WARNING LCP down
    Sep 18 19:18:28 PPP INFO sent [LCP TermAck]
    Sep 18 19:18:28 PPP ERROR User request
    Sep 18 19:18:31 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection finished
    Sep 18 19:18:31 VPN INFO PPTPS CTRL: Client pppd TERM sending
    Sep 18 19:18:31 VPN INFO PPTPS CTRL: Client pppd finish wait
    Sep 18 19:21:47 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection started
    Sep 18 19:21:47 VPN INFO PPTPS CTRL: Starting call (launching pppd, opening GRE)
    Sep 18 19:21:47 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0xb4d2479f pcomp accomp]
    Sep 18 19:21:47 PPP INFO rcvd [LCP Req mru=1400 magic=0x7fec31e0 pcomp accomp callback=CBCP]
    Sep 18 19:21:47 PPP INFO sent [LCP Rej callback=CBCP]
    Sep 18 19:21:47 PPP INFO rcvd [LCP Ack asyncmap=0x0 auth=chap-MS-v2 magic=0xb4d2479f pcomp accomp]
    Sep 18 19:21:47 PPP INFO rcvd [LCP Req mru=1400 magic=0x7fec31e0 pcomp accomp]
    Sep 18 19:21:47 PPP INFO sent [LCP Ack mru=1400 magic=0x7fec31e0 pcomp accomp]
    Sep 18 19:21:47 PPP INFO sent [CHAP Challenge (66ca5d49b11e907dbd2a29cb61324d91), name = "pptpd"]
    Sep 18 19:21:47 PPP INFO rcvd [LCP code=0xc]
    Sep 18 19:21:47 PPP INFO sent [LCP CodeRej]
    Sep 18 19:21:47 PPP INFO rcvd [LCP code=0xc]
    Sep 18 19:21:47 PPP INFO sent [LCP CodeRej]
    Sep 18 19:21:47 PPP INFO rcvd [CHAP Response (c6ab59d63395cebbe4cc7b2e22e495d900000000000000001 ea0d1513f578c529e2ea110d3ede20707d94b8be7b0006e00) , name = "cassiopea"]
    Sep 18 19:21:47 PPP INFO sent [CHAP Success "S=C5B292E12BC0940123C080827EB5B18BC2AF9F61 M=Access granted"]
    Sep 18 19:21:47 PPP INFO sent [CCP ConfReq mppe +H -M +S -L -D -C]
    Sep 18 19:21:47 PPP INFO rcvd [proto=0x8057] 01 05 00 0e 01 0a cc e3 63 a0 ef 95 68 1a
    Sep 18 19:21:47 PPP INFO sent [LCP ProtRej]
    Sep 18 19:21:47 PPP INFO rcvd [CCP ConfReq mppe +H -M -S -L -D -C]
    Sep 18 19:21:47 PPP INFO sent [CCP ConfNak mppe +H -M +S -L -D -C]
    Sep 18 19:21:47 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 ms-wins=0.0.0.0 dns3=0.0.0.0 ms-wins=0.0.0.0]
    Sep 18 19:21:47 PPP INFO sent [IPCP TermAck]
    Sep 18 19:21:47 PPP INFO rcvd [CCP ConfAck mppe +H -M +S -L -D -C]
    Sep 18 19:21:47 PPP INFO rcvd [CCP ConfReq mppe +H -M +S -L -D -C]
    Sep 18 19:21:47 PPP INFO sent [CCP ConfAck mppe +H -M +S -L -D -C]
    Sep 18 19:21:47 PPP INFO sent [IPCP Req addr=192.168.10.200]
    Sep 18 19:21:48 PPP INFO rcvd [IPCP Ack addr=192.168.10.200]
    Sep 18 19:21:49 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 ms-wins=0.0.0.0 dns3=0.0.0.0 ms-wins=0.0.0.0]
    Sep 18 19:21:49 PPP INFO sent [IPCP Rej ms-wins=0.0.0.0 ms-wins=0.0.0.0]
    Sep 18 19:21:49 PPP INFO rcvd [IPCP Req addr=0.0.0.0 dns1=0.0.0.0 dns3=0.0.0.0]
    Sep 18 19:21:49 PPP INFO sent [IPCP Nak addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 19:21:49 PPP INFO rcvd [IPCP Req addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 19:21:49 PPP INFO sent [IPCP Ack addr=192.168.10.90 dns1=192.168.10.200 dns3=192.168.10.200]
    Sep 18 19:38:19 PPP INFO rcvd [LCP TermReq]
    Sep 18 19:38:19 PPP ERROR LCP down
    Sep 18 19:38:19 PPP WARNING LCP down
    Sep 18 19:38:19 PPP INFO sent [LCP TermAck]
    Sep 18 19:38:19 PPP ERROR User request
    Sep 18 19:38:23 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection finished
    Sep 18 19:38:23 VPN INFO PPTPS CTRL: Client pppd TERM sending
    Sep 18 19:38:23 VPN INFO PPTPS CTRL: Client pppd finish wait
    Sep 18 20:00:22 OTHER INFO Mail successfully.
    Sep 18 23:12:13 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 18 23:12:13 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 18 23:12:14 VPN WARNING PPTPS MGR: initial packet length 18245 outside (0 - 220)
    Sep 19 15:45:51 VPN INFO PPTPS CTRL: Client 77.43.90.225 control connection started
    Sep 19 15:45:51 VPN INFO PPTPS CTRL: Starting call (launching pppd, opening GRE)
    Sep 19 15:45:51 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0x163e260a pcomp accomp]
    Sep 19 15:45:51 PPP INFO rcvd [LCP Req mru=1400 magic=0x7c831920 pcomp accomp callback=CBCP]
    Sep 19 15:45:51 PPP INFO sent [LCP Rej callback=CBCP]
    Sep 19 15:45:51 PPP INFO rcvd [LCP Req mru=1400 magic=0x7c831920 pcomp accomp]
    Sep 19 15:45:51 PPP INFO sent [LCP Ack mru=1400 magic=0x7c831920 pcomp accomp]
    Sep 19 15:45:54 PPP INFO sent [LCP Req asyncmap=0x0 auth=chap-MS-v2 magic=0x163e260a pcomp accomp]
    Sep 19 15:45:54 PPP INFO rcvd [LCP Ack asyncmap=0x0 auth=chap-MS-v2 magic=0x163e260a pcomp accomp]
    Sep 19 15:45:54 PPP INFO sent [CHAP Challenge (36f0d4103affb9d2825b82854905ca55), name = "pptpd"]
    Sep 19 15:45:54 PPP INFO rcvd [LCP code=0xc]
    Sep 19 15:45:54 PPP INFO sent [LCP CodeRej]
    Sep 19 15:45:54 PPP INFO rcvd [LCP code=0xc]
    Sep 19 15:45:54 PPP INFO sent [LCP CodeRej]
    Sep 19 15:45:54 PPP INFO rcvd [LCP code=0xc]
    Sep 19 15:45:54 PPP INFO sent [LCP CodeRej]
    Sep 19 15:45:54 PPP INFO rcvd [CHAP Response (e5afdff5bcb0acb9c4903e5babbe5d4100000000000000003 cbd3285202b22e6ac9cfe615297ae0cecc6fadcb423a8a400) , name = "cassiopea"]
    Sep 19 15:45:54 PPP INFO sent [CHAP Success "S=B3015CEAA551ECE77CE3A3B1E94A03F87C9D6C1C M=Access granted"]
    Sep 19 15:45:54 PPP INFO sent [CCP ConfReq mppe +H -M +S -L -D -C]
    Sep 19 15:45:54 PPP INFO rcvd [proto=0x8057] 01 05 00 0e 01 0a 98 60 68 9d b6 24 f8 98



    Any ideas?

  6. #6
    Sep 15 23:12:15 VPN ERROR PPTPS MGR: dropped small initial connection
    Sep 15 23:12:16 VPN ERROR PPTPS MGR: dropped small initial connection

    It seems the request packets are too small so the router dropped it. Please try to change the MTU value of you client to the same as your PPTP Server's.

  7. #7
    OK, i'll try
    But i have to change the MTU value in the tp-link or in the windows client?


 

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