lost L2TP vpn after upgrade

RouterOS General
1

Had it working from a win 8 client to my RB133 but lost the ability to connect after moving to 6.27.
Same config works on my RB751U.

Update - the 751 can connect as an L2TP client to the 133.

This is the error log

apr/03 23:41:14 ipsec,debug,packet ipsec: ==========
apr/03 23:41:14 ipsec,debug,packet ipsec: 68 bytes message received from xxx.xxx.64
.109[12564] to xxx.xxx.162.99[4500]
apr/03 23:41:14 ipsec,debug,packet ipsec: b4268be6 a914a1ac 9487b356 1f52ab5f 0510
0201 00000000 00000044 e8a9a97f
apr/03 23:41:14 ipsec,debug,packet ipsec: 78ca7698 a9f28c4f 97791d5b e11718da 9f30
4f5a a9710ab7 ad29db9d 3b365e25
apr/03 23:41:14 ipsec,debug,packet ipsec: 81702dae
apr/03 23:41:14 ipsec,debug,packet ipsec: encryption(3des)
apr/03 23:41:14 ipsec,debug,packet ipsec: IV was saved for next processing:
apr/03 23:41:14 ipsec,debug,packet ipsec: 3b365e25 81702dae
apr/03 23:41:14 ipsec,debug,packet ipsec: encryption(3des)
apr/03 23:41:14 ipsec,debug,packet ipsec: with key:
apr/03 23:41:14 ipsec,debug,packet ipsec: a71d6315 f0594adf 16979f9b 278ce6ef 83f4
f972 f8f252e6
apr/03 23:41:14 ipsec,debug,packet ipsec: decrypted payload by IV:
apr/03 23:41:14 ipsec,debug,packet ipsec: 20f0e9ac cab2f65b
apr/03 23:41:14 ipsec,debug,packet ipsec: decrypted payload, but not trimed.
apr/03 23:41:14 ipsec,debug,packet ipsec: 1cf7d51f 1fbbf157 2bb8417c bebcc9a5 d775
2721 b0c5f46f e37119bf 5a98ee35
apr/03 23:41:14 ipsec,debug,packet ipsec: 6e547a54 e5784ddd
apr/03 23:41:14 ipsec,debug,packet ipsec: padding len=222
apr/03 23:41:14 ipsec,debug,packet ipsec: skip to trim padding.
apr/03 23:41:14 ipsec,debug,packet ipsec: decrypted.
apr/03 23:41:14 ipsec,debug,packet ipsec: b4268be6 a914a1ac 9487b356 1f52ab5f 0510
0201 00000000 00000044 1cf7d51f
apr/03 23:41:14 ipsec,debug,packet ipsec: 1fbbf157 2bb8417c bebcc9a5 d7752721 b0c5
f46f e37119bf 5a98ee35 6e547a54
apr/03 23:41:14 ipsec,debug,packet ipsec: e5784ddd
apr/03 23:41:14 ipsec,debug,packet ipsec: begin.
apr/03 23:41:14 ipsec,debug,packet ipsec: seen nptype=5(id)
apr/03 23:41:14 ipsec,debug ipsec: invalid length of payload

2

Just figured out that XP will connect from a Virtualbox VM under windows 8, so I thought something in win 8 must have changed with an update.

For reasons totally unknown to me I tried connecting from win 8 while the vpn was still connected in the VM and it worked.

I dropped the VM connection and have been able to get win 8 to connect 3 times in a row without using XP.

My test 751 would not work from win 8 either, so I added PPTP but that didn’t work. As soon as I deleted that interface L2TP started working again.

Like Rosanna said, “It’s always something.”