This message means you have connected via SSL instead of IPsec, which is typically slower.
Check that you have a rule allowing the application ipsec-esp-udp and ensure that the client side / nothing else is blocking access to the gateway on UDP/4501
Check the traffic logs on the gateway for port 4501 to see if this is being denied on the firewall side (if you log everything anyway).
Please find the Global protect Logs
(P5096-T20276)Debug( 25): 03/01/21 09:09:19:601 create thread 0x774 with thread ID 2636
(P5096-T20276)Debug(2325): 03/01/21 09:09:19:601 Start FlushDNSCache thread 0x774
(P5096-T20276)Debug( 575): 03/01/21 09:09:19:601 Save route table snapshot...
(P5096-T20276)Debug( 780): 03/01/21 09:09:19:601 sslvpn connect() succeed
(P5096-T20276)Debug( 782): 03/01/21 09:09:19:601 Send notification of The network connection is unreliable and GlobalProtect reconnected using an alternate method. You may experience slowness when accessing the internet or business applications..
(P5096-T20276)Debug(1730): 03/01/21 09:09:19:603 Send response to client for request gateway-failed
(P5096-T20276)Debug(10891): 03/01/21 09:09:19:603 VPN tunnel is connected.
(P5096-T20276)Debug(10895): 03/01/21 09:09:19:603 Enable life time and create life time thread.
(P5096-T20276)Debug( 25): 03/01/21 09:09:19:603 create thread 0x7bc with thread ID 3624
(P5096-T20276)Debug(6849): 03/01/21 09:09:19:603 --Set state to Connected
(P5096-T3624)Debug(4317): 03/01/21 09:09:19:603 LifeTimeThread starts
(P5096-T20276)Debug(1142): 03/01/21 09:09:19:604 Display hip report V4 on the UI
(P5096-T20276)Debug(11159): 03/01/21 09:09:19:604 SetVpnStatus called with new status=1, Previous Status=0
(P5096-T20276)Debug(4161): 03/01/21 09:09:19:604 UpdatePrelogonStateForSSO() - User-logon tunnel state = Connected
(P5096-T20276)Debug(2660): 03/01/21 09:09:19:607 Tunnel is created with the gateway deltacrp.dyndns.org
(P5096-T20276)Debug(1605): 03/01/21 09:09:19:607 Refresh proxy
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