i cant connect to server to solo. also get errors on rpcport that it is not good etc. time for a wallet update? on linux i cant connect my miners and qt in windows dont even start. gets error message and terminate.
looks almost if rpc port is not right. is it 12378?

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I'm not familiar with solomining this great coin, but according to the first post of this topic it really is 12378.
I don't have added any extra addnodes or something, and my wallet did synch a few days ago. I can't try it now cuz I'm not at home now, but I don't have any troubles with synching it. Can't you find an active pool for mining GrandCoin?