Problem with loggin on online medical page

[Matchek]

Hi, i have problem with logging on: https://online.medicover.pl/NetworkWeb/

i get this error:  System.Web.UI.ViewStateException: Invalid viewstate
it is caused by pfsense.
Any ideas why this happen ?

[jimp]

Not enough to say for sure.

Some random guesses:

• Multi-WAN Load Balancing - that server may be enforcing a login/IP relationship, need to force traffic to that server out a single WAN
• Squid/Proxy interference of some sort, find a way to make that site bypass the proxy.

[Matchek]

Yep, Multi-WAN was the problem. And it's still problem. I create multiwan for failover but sometimes it looks like WAN's are agregated and use both WAN on the sime time. Should it work that way ? Now I turn off multiwan and looking for solution….

[jimp]

With load balancing, each connection can go out a different WAN.

Browsers often make multiple connections to a remote server to speed up transfers, so that means they could have half their connections going out WAN1 and others out WAN2.

[stephenw10]

Just add a firewall rule that sends all traffic with destination 'medicover.pl' via a single WAN.
See attached picture for an example. I have an alias 'load balance exceptions' where I have a list of websites that don't work with multiple WAN connections. Traffic destined for those is routed only via the default WAN but you could specify which WAN to use there.

Alternatively if you really want only failover, and not load balancing, then lower the priority of one WAN in the gateway group.

Steve