Home » Kerio User Forums » Kerio Control » ANDROID IPSEC VPN PROBLEMS - CONNECTION AND PACKET DROPS (VPN connection between android and kerio drops after few seconds/packets without any apparent reason)

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we're currently experiencing a big problem with the VPN connection with our Android devices (we tried with samsung galaxy tab4, nexus, galaxy s4, galaxy s3 etc.) and our corporate Kerio Control.

As per documentation the VPN connection has been configured correctly and we can connect properly from android. If we start an infinite ping from the android device to any of our corporate host it works perfectly.

The problem happens when we start to flow some more "complex" traffic through the tunnel (e.g. RDP, etc).
After a while(few seconds) the vpn connection seems to drop and we don't see any more packet flowing into the tunnel.
Inside Kerio Control Administration Interface we still see the connection up, but no packets sent from Android reach our network.

It seems to be something like an incompatibility problem between Kerio L2TP/IPSEC and Android L2TP/IPSEC.

Did anybody experience this problem? How did you solve it?

Thank you very much.

[Updated on: Thu, 27 November 2014 09:51]


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This is what i found in the kerio debug log when starting an RDP session:

[18/Nov/2014 17:04:18] {pppd} pppd[18549]: rcvd [LCP ProtRej id=0x2 6c 5d 69 74 00 6c 4f a3 46 0c a2 b6 94 28 6d 90 c8 d1 0f 5b c2 f9 e0 d3 ec 71 5a 3b 47 c8 04 9b ...]
[18/Nov/2014 17:04:18] {pppd} pppd[18549]: Protocol-Reject for unsupported protocol 0x6c5d
[18/Nov/2014 17:04:18] {pppd} pppd[18549]: rcvd [CCP ResetReq id=0x2]
[18/Nov/2014 17:04:18] {pppd} pppd[18549]: sent [CCP ResetAck id=0x2]
[18/Nov/2014 17:04:19] {pppd} pppd[18549]: rcvd [LCP ProtRej id=0x3 00 5b f2 dc ee 8e c3 2c 2f e6 86 2a bc 0d 56 9b 26 56 4b 88 b9 be ac 47 9c f5 b4 5e ba 73 42 78 ...]
[18/Nov/2014 17:04:19] {pppd} pppd[18549]: Protocol-Reject for unsupported protocol 'Vendor-Specific Network Protocol' (0x5b)

Before the start of the RDP session, Android can ping correctly the hosts on the corporate network.
After the launch of the RDP session (which freezes) i see these log entries in debug log and also the ping from android stops working.

[Updated on: Tue, 18 November 2014 17:07]

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