# Svpn on Linux clients gets ERROR 504 response from server **URL:** \ **Category:** Technical Forums\ **Tags:** vpn, application-delivery\ **Created:** [November 4, 2026, 8:09am UTC](https://community.f5.com/t/svpn-on-linux-clients-gets-error-504-response-from-server/77678 "2026-11-04T08:09:02Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![al\_c](https://avatars.discourse-cdn.com/v4/letter/a/ecc23a/32.png) [@al\_c](https://community.f5.com/u/al_c)\ **Post date:** [November 4, 2026, 8:09am UTC](https://community.f5.com/t/svpn-on-linux-clients-gets-error-504-response-from-server/77678/1 "2026-11-04T08:09:02Z")
Hello, Hello, My org has 2 F5 vpn tunnels: One is available from outside the network, which is working fine. the other - the one where some\* Linux users experience the issue - is available from internal 10.8.x.x. network. (Windows and MacOS users connect without issues) \* Some Linux clients, different distro families, get error 504 from the server. My CISO cant provide a solution unfortunately. so I come to you asking for suggestions on what could cause error 504? Also, why /etc/resolv.conf.fp-saved failed to create? Thank you ```auto 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 1109, SSLVpn::OpenTunnelChannel(), opening output channel. Error, -1 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 1122, SSLVpn::OpenTunnelChannel, (0x10) EXCEPTION - ERROR! Cannot open Tunnel channel 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 1488, , EXCEPTION caught: EXCEPTION 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 1497, SSLVpn::ConnectChannels(), OpenChannel() - Open failure. HTTP response=-1073740512 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 1500, SSLVpn::ConnectChannels(), (0x1b) EXCEPTION - ERROR, 504 response from server - Session is expired 2026-10-21,12:48:38:029, 32665,32669,svpn, 1, , 2048, , EXCEPTION caught: EXCEPTION!!! 2026-10-21,12:48:38:029, 32665,32669,svpn, 0,,,, --------- Exit of Tunneling Loop -------- 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, Address Netif 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 127.0.0.1/8 lo( 1) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 10.8.136.104/19 wlp0s20f3( 3) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, ::1/128 lo( 1) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, fe80::9bb6:8a32:ef42:e425/64 wlp0s20f3( 3) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, Destination Gateway Flags Netif Expire Proto Preferred Source Address 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 0.0.0.0/0 10.8.128.245 UG wlp0s20f3(3) 0 RTPROT_DHCP 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 10.8.128.0/19 link#3 U wlp0s20f3(3) 0 RTPROT_KERNEL 10.8.136.104 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 169.254.0.0/16 link#3 U wlp0s20f3(3) 0 RTPROT_BOOT 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, ::1/128 link#1 U lo(1) 0 RTPROT_KERNEL 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, fe80::/64 link#3 U wlp0s20f3(3) 0 RTPROT_KERNEL 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, --------- End -------- 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, /UDNSPatcherBase.h, 65, , failed to retrieve file stats, /etc/resolv.conf.fp-saved, No such file or directory 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, , 532, UDNSPatcherBase::RestoreResolvConf(), failed to rename, /etc/resolv.conf.fp-saved, /etc/resolv.conf, No such file or directory 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, , 2101, SSLVpn::svpn(), (0x1b) EXCEPTION - Terminate svpn 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, , 2116, , EXCEPTION caught: EXCEPTION!!! 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UIpForwardTable.cpp, 783, UIpForwardTable::SaveIpForwardTable(), Table - NULL 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, /UIpForwardTable.cpp, 692, UIpForwardTable::RestoreRouteTable, Failed to properly restore routing table. Possibly routing table is corrupted. Restart the system 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /RoutingTablePatcher.cpp, 1107, RoutingTablePatcher::RestoreAllRoutingChanges, Restoring all routing changes... 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /RoutingTablePatcher.cpp, 1054, RoutingTablePatcher::RestoreDeletedRoutes, Restoring deleted routes... 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /RoutingTablePatcher.cpp, 1022, RoutingTablePatcher::RemoveAddedRoutes, Removing added routes... 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, --------- After Restore -------- 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, Address Netif 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 127.0.0.1/8 lo( 1) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 10.8.136.104/19 wlp0s20f3( 3) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, ::1/128 lo( 1) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, fe80::9bb6:8a32:ef42:e425/64 wlp0s20f3( 3) 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, Destination Gateway Flags Netif Expire Proto Preferred Source Address 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 0.0.0.0/0 10.8.128.245 UG wlp0s20f3(3) 0 RTPROT_DHCP 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 10.8.128.0/19 link#3 U wlp0s20f3(3) 0 RTPROT_KERNEL 10.8.136.104 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, 169.254.0.0/16 link#3 U wlp0s20f3(3) 0 RTPROT_BOOT 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, ::1/128 link#1 U lo(1) 0 RTPROT_KERNEL 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, fe80::/64 link#3 U wlp0s20f3(3) 0 RTPROT_KERNEL 2026-10-21,12:48:38:030, 32665,32669,svpn, 0,,,, --------- End -------- 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, , 447, SSLVpn::svpnError(), SSLVpn::svpn: error 27, 27 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, /UDNSPatcherBase.h, 65, , failed to retrieve file stats, /etc/resolv.conf.fp-saved, No such file or directory 2026-10-21,12:48:38:030, 32665,32669,svpn, 1, , 532, UDNSPatcherBase::RestoreResolvConf(), failed to rename, /etc/resolv.conf.fp-saved, /etc/resolv.conf, No such file or directory 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UChannelChain.cpp, 31, , destroying channel #5. Stats (0) - Recv=0 Send=0 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UChannelChain.cpp, 31, , destroying channel #4. Stats (0) - Recv=0 Send=0 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UChannelChain.cpp, 31, , destroying channel #3. Stats (0) - Recv=0 Send=0 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UChannelChain.cpp, 31, , destroying channel #2. Stats (0) - Recv=6218 Send=2332 2026-10-21,12:48:38:030, 32665,32669,svpn, 48, /UChannelChain.cpp, 31, , destroying channel #1. Stats (0) - Recv=5838 Send=2018 ```