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Hi All,

Suddenly my users are not able to open InfoPath based form on SharePoint 2010. I am using blackpearl 4.7. There is no changes from application side which I know we did. So I am assuming something changes at infrastructure level but I am not sure why. 

User received automated email whenever any tasks is assigned to them. In email user received below mention link for their task item which giving error.

http://k2production:81/RuntimeServices/OpenInfoPathTask.aspx?K2Server=k2production:5252&SN=14679_638&XmlFN=SKU%20Form&Lib=http://SharePoint/solutions/k2workflow/skuapproval/SKU%20Requests&OpenAsWebPage=True&DeployBrowserEnable=True&SPURL=http://SharePoint/solutions/K2workflow/skuapproval&Single=False 

However when users goes to my pending task and open the task from there they were able to open task item without any issue. Url from my pending items is below.

http://SharePoint/solutions/k2workflow/skuapproval/_layouts/FormServer.aspx?XmlLocation=http://SharePoint/solutions/k2workflow/skuapproval/sku%20requests/SKU%20Workflow%20-%20SKU%20Number%20Assignment%20-%20Task%20for%20domain_userName%20-%2014679_638.xml&Source=http%3a%2f%2fSharePoint%2fsolutions%2fk2workflow%2fskuapproval%2f_layouts%2fk2%2fclosepage.html&OpenIn=Browser

Note: All users has access to full permission on site. So I am not sure what is happing or what is changed, hence seeking some assistance here.

Also mention HostServer log here for both case when it was working and when it is not working.

Not Working Log 

"542036409","2022-01-06 09:20:25","Debug","General","28053","Marshal","K2Worker.Marshal","28053 Marshalling: LoadXmlFieldOnDemand K2:DomainUserName","anonymous","0.0.0.0","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","542036409","8d4589e1b8164ccdb52bfb5043e79464",""
"542036410","2022-01-06 09:20:25","Debug","Unknown","8037","SendBytes","SourceCode.Workflow.Runtime.ClientConnection.ProcessICOPEvent","8037 Sending 172.29.25.101:1441 Bytes to 70532","anonymous","0.0.0.0","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","542036410","e42551116d234731a23425746e7a77a4",""
"542036411","2022-01-06 09:20:25","Debug","Unknown","8045","SocketDisconnect","SourceCode.Workflow.Runtime.SocketListener.WorkerThread","8045 Disconnected From 172.29.25.101:1441","anonymous","0.0.0.0","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","542036411","7b93987ba89445b0ab72f4e4833a4c33",""

Log When it was working 

"534261084","2021-12-13 16:13:04","Debug","General","28053","Marshal","K2Worker.Marshal","28053 Marshalling: LoadXmlFieldOnDemand K2:DomainUserName","anonymous","0.0.0.0","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","534261084","1145dfddeef045208900d35c7943ec95",""
"534261085","2021-12-13 16:13:04","Debug","Unknown","8037","SendBytes","SourceCode.Workflow.Runtime.ClientConnection.ProcessICOPEvent","8037 Sending 172.29.25.101:2522 Bytes to 73764","anonymous","0.0.0.0","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","534261085","e6bc86a6d0334df0bfad3bff0d893335",""
"534261086","2021-12-13 16:13:06","Debug","Unknown","8047","SocketConnect","SourceCode.Hosting.Server.Services.TCPClientSocket.ProcessIOCPEvent","8047 Connected to 172.29.25.93:6219","system","fe80::fc95:3c36:7c1f:61a2%14","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","534261086","fadb843045c447cab280880ea51b45d8",""

"534261087","2021-12-13 16:13:06","Debug","Unknown","8040","IOCPThreadProcessingBytes","SourceCode.Hosting.Server.Services.TCPIOCPService.WorkerThread","8040 Processing 16 IOCP Bytes Related To 172.29.25.93:6219","system","fe80::fc95:3c36:7c1f:61a2%14","K2Production:C:Program Files (x86)K2 blackpearlHost ServerBin","534261087","f7ab33b626b54f0ebc16a8035d8d5048",""