I am tackling with a strange problem in magento 18.104.22.168, the bundle products in my magento store are not being added to the cart instead when I click on the 'Add To Cart' button it's showing-
Error 503 Service Unavailable
Service Unavailable Guru Meditation: XID: 2050290084 Varnish cache server
All the other types of products are working fine and being added to cart normally.
There's a paypal checkout button on my product view page also which is also showing the same 503 error, so i checked the form but that just looks same as the others on simple or configurable products. When I used the same theme on localhost fresh installation it just worked fine and every product or even bundle product is being added to the cart.
I searched over internet regarding this error and implemented almost every way to resolve it, i disabled shopping cart rules, changed my bundle.xml with the default one, disabled other extensions, checked my view page but none of these helped.
I have also installed Mgt Commerce Varnish in my magento, may be that's generating the error. Hence I am not much familiar with the varnish, so I am not so sure about that.
So please somebody help me in resolving this issue.