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Citric ADC external connection issues


Luis De La Rosa

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Hello all! I have a bit of an issue with my external connections through my citrix VPX. 

 

so here is what I am trying to do and what issue I have. We have backend servers that district employees access internally and externally.  We use VIPS through our ADC to connect them to said servers. Internally i create 10.x.x.x Vips and us SSL certs.  if they need to reach anything Externally, we use a DMZ VIP 172.X.X.X also using SSL certs.  internally everything works correctly.  we have no issues.  but when I am outside the network let's say at home I either get a timeout error or it takes a really long time to connect.  It also depends on what browser i use.  Chrome sometimes lets me in with no issues.  but edge and firefox timeout. I do have a http to https redirect built in to the Virtual server.  At first i thought it was a ssl issue, but internally SSL works.  and externally it also works but not all the time.  

 

I am kinda stumped.  any help will be appreciated.  

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Hi Luis

 

I've seen something similar to this in the past, and it turned out to be the NAT/port forwarding rule configured on a Palo Alto Firewall. 

The Network guy had configured the firewall rule to for "SSL NATting" rather than TCP 443 NATting. The "SSL Natting" involved packet inspection for malicious payload causing issues. 

Make sure the firewall isn't doing any funky with the packets before forwarding them to the VIP on the NetScaler

 

Regards

 

Ken Z

 

P.S. Also check your NetScaler routing. if you have a 2-arm topology make sure the default gateway is the internet and you have static routes to your internet VLANs

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