Using PI DataLink I can get current values of tags, but any attempt to get historical values gives me the above timed out error. I have tried Archive Value, Compressed Data and Sampled Data. They all give the same error. These functions previously worked, but now they do not. In addition, I wrote a VBA macro to write and read PI values. The VBA function "PiPutVal" works: it writes a current value to PI, but when I try to read the value using PIArcVal I get the timed out error.