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List: strongswan-users
Subject: Re: [strongSwan] Unable to establish connection with Fortigate device
From: Andreas Steffen <andreas.steffen () strongswan ! org>
Date: 2021-03-01 12:16:40
Message-ID: 5bdff87c-54f4-0627-4f3f-b5ac55810588 () strongswan ! org
[Download RAW message or body]
Hello Lorenzo,
if you define DH group 15 (modp3072) only but the peer's proposals
are for MODP1536 and MODP2048 then the negotiatio hast to fail with
ike Negotiate ISAKMP SA Error: ike
0:fc70f37fa6c9ee8d/0000000000000000:383: no SA proposal chosen
Best regards
Andreas
On 01.03.2021 08:03, Lorenzo Milesi wrote:
> Hi.
> I'm trying to set up a IPSec connection between a StrongSwan server and a Fortigate \
> device. Auth uses PSK, so according to [1] I've chosen IKEv1. The Fortigate is \
> behind an ADSL modem.
> In Fortinet I've set P1 to enc AES256 auth SHA256, DH 15, key lifetime 86400.
>
> This is ipsec.conf:
>
> config setup
> charondebug="ike 3, knl 3, cfg 3, net 3, esp 3, dmn 3, mgr 3"
> uniqueids=yes
> strictcrlpolicy=no
>
>
> conn sts-base
> fragmentation=yes
> dpdaction=restart
> ike=aes256-sha256-modp3072
> esp=aes256-sha256
> keyingtries=%forever
> leftsubnet=172.16.12.0/24
> lifetime=86400
>
> conn site-3-legacy-base
> keyexchange=ikev1
> rightid=L***
> also=sts-base
> ike=aes256-sha256-modp3072
> esp=aes256-sha256
> rightsubnet=192.168.4.0/24,192.168.5.0/24
> right=95.x.x.x
> leftauth=psk
> auto=start
>
>
> This is the debug log on fortinet, which seems the problematic side (doesn't like \
> other party offers):
> ike 0:to VpnTunnelName:378: out \
> 8AD3789557DB282D9AA1D56EDDD9184605100201000000000000006C6EFC8335B133C6267388C1A0BEB6 \
> 3B6A2CC4E120DE7627C9166D99AFF9EAE094E5368631BB2626D86B31FFED37F29DB6CC4E5D6B2E8B9A6FA79DF8FC03531CB7EB476EC1CE6240D586943E6A675E4695
> ike 0:to VpnTunnelName:378: sent IKE msg (P1_RETRANSMIT): \
> 192.168.1.2:4500->95.x.x.x:4500, len=108, id=8ad3789557db282d/9aa1d56eddd91846 ike \
> 0: comes 62.11.245.232:500->192.168.1.2:500,ifindex=4.... ike 0: IKEv1 \
> exchange=Identity Protection id=fc70f37fa6c9ee8d/0000000000000000 len=452 ike 0: in \
> FC70F37FA6C9EE8D00000000000000000110020000000000000001C40D00015400000001000000010000 \
> 0148010100080300002801010000800B0001000C00040001518080010007800E00808003000180020004 \
> 8004000E0300002802010000800B0001000C00040001518080010007800E008080030001800200048004 \
> 00050300002803010000800B0001000C00040001518080010007800E010080030001800200048004000E \
> 0300002804010000800B0001000C00040001518080010007800E01008003000180020004800400050300 \
> 002805010000800B0001000C00040001518080010007800E008080030001800200028004000E03000028 \
> 06010000800B0001000C00040001518080010007800E0080800300018002000280040005030000280701 \
> 0000800B0001000C00040001518080010007800E010080030001800200028004000E0000002808010000 \
> 800B0001000C00040001518080010007800E01008003000180020002800400050D000014AFCAD71368A1 \
> F1C96B8696FC775701000D0000144048B7D56EBCE88525E7DE7F00D6C2D30D0000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000000000148299031757A36082C6A621DE00000000
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: responder: main mode get 1st \
> message... ike 0:fc70f37fa6c9ee8d/0000000000000000:383: VID DPD \
> AFCAD71368A1F1C96B8696FC77570100 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: VID \
> FRAGMENTATION 4048B7D56EBCE88525E7DE7F00D6C2D3 ike \
> 0:fc70f37fa6c9ee8d/0000000000000000:383: VID FRAGMENTATION \
> 4048B7D56EBCE88525E7DE7F00D6C2D3C0000000 ike \
> 0:fc70f37fa6c9ee8d/0000000000000000:383: VID FORTIGATE \
> 8299031757A36082C6A621DE00000000 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> incoming proposal: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = 0:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=128 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA2_256. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP2048. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=128 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA2_256. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP1536. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=256 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA2_256. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP2048. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=256 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA2_256. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP1536. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=128 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP2048. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=128 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP1536. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=256 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP2048. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: proposal id = \
> 0: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: protocol id = ISAKMP:
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: trans_id = KEY_IKE.
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: encapsulation = IKE/none
> ike 0:fc70f37fa6c9ee8d/0000000000000000:383: type=OAKLEY_ENCRYPT_ALG, \
> val=AES_CBC, key-len=256 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_HASH_ALG, val=SHA. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=AUTH_METHOD, val=PRESHARED_KEY. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> type=OAKLEY_GROUP, val=MODP1536. ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> ISAKMP SA lifetime=86400 ike 0:fc70f37fa6c9ee8d/0000000000000000:383: negotiation \
> failure ike Negotiate ISAKMP SA Error: ike 0:fc70f37fa6c9ee8d/0000000000000000:383: \
> no SA proposal chosen ike 0:to VpnTunnelName:378: negotiation timeout, deleting
> ike 0:to VpnTunnelName: connection expiring due to phase1 down
> ike 0:to VpnTunnelName: deleting
> ike 0:to VpnTunnelName: deleted
> ike 0:to VpnTunnelName: schedule auto-negotiate
> ike 0:to VpnTunnelName: auto-negotiate connection
> ike 0:to VpnTunnelName: created connection: 0x424aff8 4 192.168.1.2->95.x.x.x:500.
> ike 0:to VpnTunnelName:384: initiator: main mode is sending 1st message...
> ike 0:to VpnTunnelName:384: cookie c10b9be64dc0d904/0000000000000000
> ike 0:to VpnTunnelName:384: out \
> C10B9BE64DC0D90400000000000000000110020000000000000001240D00003C00000001000000010000 \
> 0030010100010000002801010000800B0001000C00040001518080010007800E01008003000180020004 \
> 8004000F0D0000144A131C81070358455C5728F20E95452F0D0000147D9419A65310CA6F2C179D921552 \
> 9D560D000014CD60464335DF21F87CFDB2FC68B6A4480D00001490CB80913EBB696E086381B5EC427B1F \
> 0D00001416F6CA16E4A4066D83821A0F0AEAA8620D0000144485152D18B6BBCD0BE8A8469579DDCC0D00 \
> 0014AFCAD71368A1F1C96B8696FC775701000D0000144048B7D56EBCE88525E7DE7F00D6C2D30D0000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000000000148299031757A36082C6A621DE00000000
> ike 0:to VpnTunnelName:384: sent IKE msg (ident_i1send): \
> 192.168.1.2:500->95.x.x.x:500, len=292, id=c10b9be64dc0d904/0000000000000000 ike 0: \
> comes 95.x.x.x:500->192.168.1.2:500,ifindex=4.... ike 0: IKEv1 exchange=Identity \
> Protection id=c10b9be64dc0d904/589d6282b4f462c9 len=164 ike 0: in \
> C10B9BE64DC0D904589D6282B4F462C90110020000000000000000A40D00003C00000001000000010000 \
> 003001010001000000280101000080010007800E0100800200048004000F80030001800B0001000C0004 \
> 000151800D00000C09002689DFD6B7120D000014AFCAD71368A1F1C96B8696FC775701000D0000184048B7D56EBCE88525E7DE7F00D6C2D380000000000000144A131C81070358455C5728F20E95452F
> ike 0:to VpnTunnelName:384: initiator: main mode get 1st response...
> ike 0:to VpnTunnelName:384: VID draft-ietf-ipsra-isakmp-xauth-06.txt \
> 09002689DFD6B712 ike 0:to VpnTunnelName:384: VID DPD \
> AFCAD71368A1F1C96B8696FC77570100 ike 0:to VpnTunnelName:384: DPD negotiated
> ike 0:to VpnTunnelName:384: VID FRAGMENTATION \
> 4048B7D56EBCE88525E7DE7F00D6C2D380000000 ike 0:to VpnTunnelName:384: VID RFC 3947 \
> 4A131C81070358455C5728F20E95452F ike 0:to VpnTunnelName:384: selected NAT-T \
> version: RFC 3947 ike 0:to VpnTunnelName:384: negotiation result
> ike 0:to VpnTunnelName:384: proposal id = 1:
> ike 0:to VpnTunnelName:384: protocol id = ISAKMP:
> ike 0:to VpnTunnelName:384: trans_id = KEY_IKE.
> ike 0:to VpnTunnelName:384: encapsulation = IKE/none
> ike 0:to VpnTunnelName:384: type=OAKLEY_ENCRYPT_ALG, val=AES_CBC, \
> key-len=256 ike 0:to VpnTunnelName:384: type=OAKLEY_HASH_ALG, val=SHA2_256.
> ike 0:to VpnTunnelName:384: type=AUTH_METHOD, val=PRESHARED_KEY.
> ike 0:to VpnTunnelName:384: type=OAKLEY_GROUP, val=MODP3072.
> ike 0:to VpnTunnelName:384: ISAKMP SA lifetime=86400
> ike 0:to VpnTunnelName:384: out \
> C10B9BE64DC0D904589D6282B4F462C90410020000000000000001FC0A000184FD41F812E5C6DE946C19 \
> 8E07D71ED83CA1AB034F7AC7EA9C9DB184B2B0D2C35C8C2BEB7E6B298B87A5736D8344DDA782E3D813DE \
> 08FA8FD8423892B18F10E9DD24C23C81AB9C0BF5A56DEE1D0577CB4B0161A7CB88832FB484C4433B3FB2 \
> 0386EEFABCFCF0B862C61EA21EB6783EAE9A2C11156BC929113D2A5A9FB9D4DF7D8B09B26EC447FAA352 \
> 19E95CF5D6436F68379BA3CA42E10C06B9924EF3CAF6EEACB95EFC2781FBBD4AC29C4C11426BCB28AFCF \
> 87D0B448A2B265322612526B56AED5192548CD958565FB5DC7036E6A953B7A99BDC5DB3DEE1A1E4008EA \
> 20E44BAF8C2BDB4DEC62DFADF29B1587A1C42429711694EA0F6E702DB541C08D3E40A1A7D089EF57A1CC \
> BD6AC286D79927306533A2DB587990C0FCE20010A12A826218CEDA95EEBE08AB4623479C0A699284D4EF \
> 602EB8855B88040F117E10AB3F18A065759DBF31C359622F2A52500988D7F9FE1D3569CC49070387B05A \
> 289B3DA8443F7DAFFF248064B2687503E81E4DDA38478659A53DD15D35EA326B4F90AC7821DC14000014 \
> 659CD5B151F1779BA7C8D21003510EB6140000247CA2BC74DD9D1E4D89993957656B637ECB524C9E6911 \
> 7E86ED55949C6C3DB0260000002488B2BA8589F1C3AE72E9E5EEC659F89AE235D2451581D4A6820F1E1FC73EB8BE
> ike 0:to VpnTunnelName:384: sent IKE msg (ident_i2send): \
> 192.168.1.2:500->95.x.x.x:500, len=508, id=c10b9be64dc0d904/589d6282b4f462c9 ike 0: \
> comes 95.x.x.x:500->192.168.1.2:500,ifindex=4.... ike 0: IKEv1 exchange=Identity \
> Protection id=c10b9be64dc0d904/589d6282b4f462c9 len=524 ike 0: in \
> C10B9BE64DC0D904589D6282B4F462C904100200000000000000020C0A00018494E5DE50E190B4D173E5 \
> 2E36616C64FEF471C0F85ACB206E8A76B32B425E35326F27ACF0C57CA5E6F50951E72E67F0798CEFA552 \
> 5A40D6B4EBBCD7BD028EDF39A72DAA9B0D0D274A9DF0B21D37D72E03B9E188F08FD3C56E33CC1772AEF9 \
> 6B809CA4372FA9D1B3D0815722035722C85DC7B7CCDB96FF7D713A30327FAF173D8934B9D484D4F009A4 \
> 58A48A943D7B1A49F056E25E398A43832474F776339AB55D9298F0E15F79B14619882B8AD3B86094F045 \
> 07A06FC651256ABEF72F090E5579EE9D138314A7F8C2184EBB68526149F2F375224B825CD78553E2089F \
> 00D60460A36F76EC46FE8B5B17EA07E15AC4FB8F79D3221ABD2FA47F0524AF025DB15A32B67EBC1D0799 \
> 6E62FE0FA1379DC320D54AFF6A0DA4EFE2EEAE112529F3103B8F49A524DBB9C9C4D72194E6B4CC002067 \
> F79337B46B365F5C95CD537EE18C4F41A947D641516023D7A705159BC61D109710FA6A5B20C99F87CC9C \
> C0BE736EAA178E0D07B3282D669901298B40CD24C7EBBA64A72989441A9CE1E33DAFC57915A414000024 \
> 965FEDABF0477240EAEA804FF51B9AE8ED87EF3B4C689DC2A192836D98440226140000241DC24402C80C \
> 6E7F1EA2A5EFACD8CD9684DDB75D14C9608C931254AF4D6A8E73000000247CA2BC74DD9D1E4D89993957656B637ECB524C9E69117E86ED55949C6C3DB026
> ike 0:to VpnTunnelName:384: initiator: main mode get 2nd response...
> ike 0:to VpnTunnelName:384: received NAT-D payload type 20
> ike 0:to VpnTunnelName:384: received NAT-D payload type 20
> ike 0:to VpnTunnelName:384: NAT detected: ME
> ike 0:to VpnTunnelName:384: NAT-T float port 4500
> ike 0:to VpnTunnelName:384: ISAKMP SA c10b9be64dc0d904/589d6282b4f462c9 key \
> 32:A14C8EA6DCB45DD9A940941BDB0342AFB8D00E8153BC9EEABB117532FE53E6D0 ike 0:to \
> VpnTunnelName:384: add INITIAL-CONTACT ike 0:to VpnTunnelName:384: enc \
> C10B9BE64DC0D904589D6282B4F462C905100201000000000000006B0800000F020000004C6F63616E64 \
> 610B0000240E2C5E431EDC18A1A71432A2D63F3A735CF38FF3B15088600EA1C4DFA8DBAE540000001C0000000101106002C10B9BE64DC0D904589D6282B4F462C9
> ike 0:to VpnTunnelName:384: out \
> C10B9BE64DC0D904589D6282B4F462C905100201000000000000006C0A9523A71AA4D181655F68680E68 \
> 7AAE143646431BCF52A9AAE986F371BD20D0165F406F6525CE7BD4E99E87756AE721C2EA71E8B0D76B6DDAA3BAE63545FE806E4DABC6DBF23D09165665B8EBA17F4B
> ike 0:to VpnTunnelName:384: sent IKE msg (ident_i3send): \
> 192.168.1.2:4500->95.x.x.x:4500, len=108, id=c10b9be64dc0d904/589d6282b4f462c9 ike \
> 0: comes 95.x.x.x:4500->192.168.1.2:4500,ifindex=4.... ike 0: IKEv1 \
> exchange=Informational id=c10b9be64dc0d904/589d6282b4f462c9:3401b0f7 len=108 ike 0: \
> in C10B9BE64DC0D904589D6282B4F462C9081005013401B0F70000006CCBD929F01609C09C15FB168C6 \
> 027327324BD1D6560143B39C69FF01070831099C7520EDB88EBF51AC8CF9AFF5A8649CECE18DADC661F7EB7698D90A5ECEC8DB81EC258089F8E48EEBB2313BE63C33FF5
>
>
> I'm fairly new to strongswan so I might have missed something in the server \
> configuration. Any hint is welcome. Thanks
>
>
> [1] https://wiki.strongswan.org/projects/strongswan/wiki/Fortinet
>
--
======================================================================
Andreas Steffen andreas.steffen@strongswan.org
strongSwan - the Open Source VPN Solution! www.strongswan.org
Institute for Networked Solutions
University of Applied Sciences Rapperswil
CH-8640 Rapperswil (Switzerland)
===========================================================[INS-HSR]==
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