topic Re: Cisco AnyConnect SLOW in Broadband

Cisco AnyConnect SLOW

omaration — Wed, 12 Mar 2025 12:17:01 GMT

I have tried all the troubleshooting on this forum.

ipv6 is disabled

tried different APNs

disabled security and dos options

the signal is excellent and super fast. As soon as I connect to the work VPN, the speed slows down to a halt and pages take minutes to load.

would using an Ethernet help in this situation?

anyone had this issue with this VPN and has any other fixes I can try?

Re: Cisco AnyConnect SLOW

jr0 — Wed, 12 Mar 2025 13:33:05 GMT

What router brand/model you have?

if you reboot the router and connect straight way, is VPN slow? And have you tried the sim on your phone and create hotspot?

Re: Cisco AnyConnect SLOW

omaration — Wed, 12 Mar 2025 15:36:54 GMT

The model is NR5103EV2.

yep reboot does nothing. I haven’t that exact sim, but tired hotspot on my phone which is with EE and worked fine,albeit slow but not as slow.

IT department said the issue isn’t on their side so I am not sure

Re: Cisco AnyConnect SLOW

jr0 — Wed, 12 Mar 2025 18:17:13 GMT

I'm sure you have seen this other thread VPN slowness on Cisco
sorry but I don't think I cannot be of any further help

Re: Cisco AnyConnect SLOW

omaration — Wed, 12 Mar 2025 21:58:05 GMT

Yeah I have and no luck. Thanks for trying though!!

So without the VPN:
127.9 Mbps download

20.8Mbps upload

with VPN:

3.76Mbps download

5.19Mbps upload.

Something is wrong somewhere and not sure where.

IF anyone can help, I'd really appreciate it

Re: Cisco AnyConnect SLOW

jr0 — Thu, 13 Mar 2025 08:48:56 GMT

that's awful.
2 things I meant to say yesterday and I forgot.
- you could try Three broadbrand SIM in your phone in case your phone is 5G
- there was this post a few days ago where the VPN was not working. The router model is different so your settings will be different too. If I followed correctly the router FW was disabled and IP Passthough mode activated (instead of routing mode)
Work VPN Issues

I reckon you would be on uncharted territory if you come to discuss these settings with Three support (unless you lucky and come to some guru). But I also reckon with some tinkering and online searching you may be able to find a way - remember, may not worth bothering and move on or the setup may not work for something else and your network/pc might be too exposed (in case you disable the fw). Good luck.