https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70845#M23450 Hi, Is here anyone that successfully upgrade from version 4.0.30 to version 6.2 and using more than one app server? I did it in my DEV env (one app server) and have had no issues. However yesterday we upgraded TEST env. which has two app servers in NLB farm. I have issues with Login Agent (they not always connect to server) or after successful sign-in I get window stating "Server not available". I even removed and installed the agents again. Anyone any experience? Regards, TomekA Thu, 05 Apr 2018 17:37:00 GMT TomaszAdamski 2018-04-05T17:37:00Z https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70845#M23450 Hi, Is here anyone that successfully upgrade from version 4.0.30 to version 6.2 and using more than one app server? I did it in my DEV env (one app server) and have had no issues. However yesterday we upgraded TEST env. which has two app servers in NLB farm. I have issues with Login Agent (they not always connect to server) or after successful sign-in I get window stating "Server not available". I even removed and installed the agents again. Anyone any experience? Regards, TomekA Thu, 05 Apr 2018 17:37:00 GMT https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70845#M23450 TomaszAdamski 2018-04-05T17:37:00Z https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70846#M23451 Different versions of Blue Prism potentially require different versions of Login Agent - please check the release notes closely for information on this.  Looking at the v6.2 release notes suggests that you need to be using the Login Agent version released with 5.0.33 Wed, 11 Apr 2018 18:47:00 GMT https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70846#M23451 Denis__Dennehy 2018-04-11T18:47:00Z https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70847#M23452 Hi Denis, thank you for the answer. I am already in contact with support. There are some know issues and there have been some issues in my env. One thing quite important here is that I needed to change NLB config. After moving to WCF load balancers need to be configured to use sticky sessions.   Fri, 13 Apr 2018 17:35:00 GMT https://community.blueprism.com/t5/Product-Forum/Anyone-after-successful-upgrade-to-6-2/m-p/70847#M23452 TomaszAdamski 2018-04-13T17:35:00Z